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What could have cause this?

Discussion in 'General Plant Topics' started by blue33, Jul 21, 2008.

  1. blue33

    blue33 Junior Poster

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    What could have cause this rotala plant stem turn black? The black portion will melt off into 2 parts in the later stage but the plant is still surviving. Anyone come across this?

    IMG_1160.jpg
     
  2. ceg4048

    ceg4048 Lifetime Charter Member
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    Hi,
    Poor CO2 is a likely culprit. Degeneration of plant tissue is normally associated with poor CO2 as a primary cause but could be exacerbated by other factors such as poor nitrates. Try increasing your injection rate if this is an injected tank. If this is a non-injected tank then you may have to lower the lighting or consider adding a CO2 supplement such as Excel.

    Cheers,
     
  3. Gerryd

    Gerryd Plant Guru Team
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    Hi,

    I used to have this issue with Rotala and Ludwigia.

    Since I starting injecting additional c02, this issue no longer arises in my tank.
    Anecdotal evidence, yes, but supports ceg4048's reply.

    However, I do agree that c02 is the likely culprit, regardless of my own experience.
     
  4. blue33

    blue33 Junior Poster

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    Thanks guy. Although i can see that my CO2 indicator is showing sufficient(i'm using 4dKH solution), maybe it is not dissolving well inside the tank. It could be the reason. It appear only on rotala plant only, kind of strange. :(
     
  5. blue33

    blue33 Junior Poster

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    This is the tank i'm mentioning, could it be the plant is too closed to each other? Too compact? Is a 1.5ft cube infront curve tank.

    IMG_1236-2.jpg

    Btw the pic took is not yet CO2 injection, so the CO2 indicator colour is in dark green. I read from "badmanstropicalfish" said that too much phosphate can cause black portion to leaves and so, could it be the culprit?
     
  6. ceg4048

    ceg4048 Lifetime Charter Member
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    Yes, that is a distinct possibility. As the plants become bushier this has a tendency to block flow so that the distribution of nutrients and CO2 becomes more difficult.


    Nope, that's a distinct impossibility. Phosphorous is a critical element sought out in desperation by all plants. This is what happens to a plant when it encounters too much Phosphate:

    [​IMG]

    Add more CO2 mate.:rolleyes:

    Cheers,
     
  7. blue33

    blue33 Junior Poster

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    Thanks! So should i put the rainbar at bottom and behind to distribute the flow. Stem plants get bushy easily after few trimmed, how do we solve this, getting the flow of CO2 and nutrients distribute to them?
     
  8. ceg4048

    ceg4048 Lifetime Charter Member
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    Well, you can play with the bar location to see what works but usually the penalty at odd locations is aesthetics. One way is to use filters which have a very high throughput, or to supplement the filter flow with powerheads to get better circulation. I normally opt for the stronger filtration method as it's less obtrusive. In a small tank you can easily use a filter that has a rating of 10X to 20X the tank volume per hour turnover rate. George Farmer does this on all of his small tanks to excellent effect. You do still need to prune regularly though, but a high flow and high injection rate helps you to avoid a lot of the deterioration.

    One thing to remember also is that as the plant biomass increases so does the requirement for more CO2 and nutrients, so if you don't adjust the injection rate as more mass is created then less CO2 is available per unit mass. I would first try simply increasing the injection rate for a few weeks first, then think about higher flow if results aren't satisfactory.

    Cheers,
     
  9. blue33

    blue33 Junior Poster

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    Thanks alot for the quick reply! Wouldn't high flow rate causes TURBULENT, plants will be sway everywhere and also causes stress to fauna. Maybe thats the only way to get CO2 and nutrients to the plant bed.

    Does temperature affect the plants growth and look, said 28-30 degree celsius, i notice those tanks with chiller the plants look much nicer at around 25 degree Celsius than those at 28-30 degree celsius. Thanks!
     
  10. Gerryd

    Gerryd Plant Guru Team
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    Hi,

    Turbulence is not a bad thing. The fish like to swim against currents and will go to a quieter place to rest.

    Aquatic plants are BUILT to go with the current, so swaying is not an issue for them.

    If the fish are clinging to rocks with their fins for dear life 24/7 and cannot rest, then the flow is too much.

    Yes, good flow is the only way to get through thick plant beds........

    You want to be able to see each leaf move. Think gently swaying........if current moves over the leaf, nutrients are carried TO IT, and NH4 and dirt, etc are WASHED OFF.

    More plant species occur in warmer waters than cooler ones, esp the species we keep, so warmer temps are not an inhibitor to plant growth.

    Also folks keep discus and plants, and discus require these warmer temps you mention.

    As long as the plants are healthy and get good nutrients and light, etc, the warmer temps should not be an issue.
     
  11. ceg4048

    ceg4048 Lifetime Charter Member
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    If the turbulence is so high that it causes structural damage then yes, this is a problem, but flow rates that result in simple movement of leaf and stem are good since these flow rates deliver nutrients to the leaf surface and carry away organic waste.

    Higher temperatures generally result in high growth rates. The image I provided above is of a plant in 30 degree C typical daytime water temperature, falling to more or less typically 27C during the night. I've compared that image to one taken of the same plant a few months prior, shown below, where the temperature was between 25C-26C and I can't tell the difference in terms of nicer:
    [​IMG]

    Cheers,
     
  12. blue33

    blue33 Junior Poster

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    Thanks! So a 2ft(60cm X 40cm X40cm) tank using Eheim 2217(connecting to UV follow by external reactor) should be alright? :)
     
  13. blue33

    blue33 Junior Poster

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    Thanks! I notice that some people use wave maker to distribute the flow. Is it good? If i have thick bushy plants in the rear side, what would the best location to place the output hose. Is lily pipe a good choice for distributing CO2 and flow?
     
  14. ceg4048

    ceg4048 Lifetime Charter Member
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    Gosh, I've never used a wave maker. Sounds expensive:eek: Wouldn't a powerhead be a less expensive method? AS long as you can hide it so that it doesn't look obnoxious it ought to be very effective. I just usually get the most powerful filter or filters I can afford. I've found that spraybars mounted against the back wall work better for me but again, if the flow is high enough there is no reason the lily pipe shouldn't work in a small or mid size tank. It's always going to be difficult when there is so much mass in the tank but you seemed to have pulled it off very well. AS I mentioned, just try upping the bubble rate first before moving on to system wide changes.:cool:

    Cheers,
     
  15. blue33

    blue33 Junior Poster

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    Thanks! What do normally people do if they have massive stem plant like rotala that grow to the top at rear and to provide good flow to the massive stem plant, do they use rainbar or just a single hose at it? I have a thin layer of flimsy oil on the surface, what causes it, does adding a surface skimmer helps? How do i get rid of it? What is the best way to provide CO2, reactor or diffusers? Sorry for so many questions i have. Thanks!
     
  16. ceg4048

    ceg4048 Lifetime Charter Member
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    Well I guess you'd have to live with the problems created by the jumble in the back if you didn't want to prune regularly. I don't allow my background plants to grow out of control specifically because they tend to block flow from the spraybar which is mounted on the back wall.

    Surface film or scum is almost always associated with poor CO2 and/or nutrients or with poor flow. This is an indication of stress so if you weren't getting the film before it's kind of a message that you need to prune/thin or to increase your injection rate. These are all the same causes as discussed earlier.

    Either method if injection works. Many people use the diffusers with the ceramic disk, others use inline reactors, others use in tank reactors. It just depends on budget, aesthetics and practicality.

    Cheers,
     
  17. blue33

    blue33 Junior Poster

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    Thank you for answering those questions, really appreciated it. Thanks. :)
     
  18. Mooner

    Mooner Lifetime Charter Member
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    Ceg,
    What exactly in this photo are we to see concerning too much phosphate??
    Thanks
     
  19. Gerryd

    Gerryd Plant Guru Team
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    If I know ceg, it is just how nice the plant is with an 'overdose' of phosphate......
     
  20. Mooner

    Mooner Lifetime Charter Member
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    Oh, thought he really was showing something:confused:
     
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