Is This Algae Or Bacteria Bloom Or Diatom

[Eugene]

Dear all, I did the tank plantation about 3 weeks ago. In the first 2 weeks, I did three water changes each week and every plant had a satisfying growth. But, after that first 2 weeks, some brown filamentous grew on some plants and the soil around. Since then, I did water changes everyday and did some suctioning to those filamentous. However, until today the filamentous has not gone. It spreads to another plan. So, does that filamentous classified as algae/bloom bacteria/diatom? And how to solve this kind of problem?
My tank detail is 360liter, Lighting 260 watt DIY, CO2 is 2BPS on 2 hours before light on and off 1 hour before light off, EI fertilizer, GH 5, KH 6, PH 7, water temp 24. Plant is HC, UG, HG mini, Weeping Moss, Flame Moss and Ricardia. Attached is the tank condition.
Thank you

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[Allwissend]

I did water changes everyday ... CO2 is 2BPS on 2 hours before light on and off 1 hour before light off, EI fertilizer,

It looks like diatoms to me . In diatom biofilms you can find a great deal of bacterial diversity as well as many zooplankton. This type of biofilm is typical for new environments and low nutrient environments.

So when the tank matures the diatoms will be replaced by other bacterial populations more adapted for environments with higher nutrient level. I selected from your post above 2 issues which jumped :

1. Daily water changes and EI . They work great, but you need to add enough nutrients back to the water. Normally you would do 50% every week after adding 20mg/L NO3 that week. So without plant uptake for the week you would have close to 40mg/L. With plant uptake you are more likely to be a little bit above 20mg/L. When you change 50% water daily, you would at maximum have a concentration close to 2x the daily dose. Say you add 4mg/l daily, you would have close to 8mg/L in the water with no plant uptake. So 5x less, see what I mean ? Now no need to add the full weekly dose daily, but I would try and add about 10mg/L NO3 daily with daily water change. Adjust the dosing of ALL nutrients with a similar mindset.

2. The CO2 dosing may need some improvement. If you can get a drop checker with 4dKH indicator solution in it and a pH pen/meter. You should aim for close to 1pH drop between degassed pH and the pH at light on. BPS is like pressing on a car /bike tire to see if the it need to be inflated. Having good CO2 from the star is conducive to a great planted aquarium experience.

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[Laurence Turner]

Diatom is pretty common when setting up a new tank, normally it will clear relatively easily.

What lighting period are you using? there is a really good guide by tropica

If you measure the pH of the water every hour you build up a profile and start fine tuning the co2 levels, most people in the UK are aiming for around 6.5, you also need to make sure you have good circulation.

I would cut back to only changing the water twice a week, you need to build up good bacteria, but I would change at least 50%.

Before you do this give everything you can a really good clean. Most the algae on the rocks and glass should come off reasonably easily.

After the water change I would spot dose the plants with flourish excel or easy carbo.

 

[Eugene]

Thank you guys for you kind attention. By the way the diatom is alteady gone, but at the moment my tank there is a lot of algae, i don’t know is thread algae or hair algae or spirogyra or cladophora. But i quess is thread algae because in two weeks I add too much iron because my moss colour is not green enough.


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[Eugene]

Not only my moss, all my red plant turning to green


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[skija]

Your problem seem to be this "Lighting 260 watt DIY" , you have too much light and not enough co2 .

 

[Laurence Turner]

260 watts does seem very high.. when setting up a tank I would go for around 35 watts per 100 litre, possibly increasing to 70 when everything is doing well and your algae free.

Can you turn it down? Do you have pwm control or can you lower the voltage or even take out some of the LEDs?

What kind of circulation do you have? Text book says that you should have 10x the tank volume per hour. Personally I think this is a bit excessive anything over 5 and I wouldn't worry.
As a guide the plants should be gently moving.

 

[Laurence Turner]

Assuming your running LEDs..