Looking for some expert information on algae!

Hi,
I tried asking about this on other forums but couldn't really seem to find anyone who really knows what's going on. I don't just want to know what to do, I want to know why, I'm sure someone here has a good understanding of the chemistry and biology involved which is what I really want to understand.

I have a 10g and initially had Hygrophia polysperma and a java fern planted in it. Over the course of several months the blue green algae (I'm assuming that's what it is based on descriptions, it was like a thick black sheet if it grew long enough) totally took over my tank. It didn't seem to matter how often I would clean it out, or even if I would physically remove it from every single leaf of my plants, it would come back with a vengeance before my next water change (and I would do them weekly). I had two screw-in florescent bulbs, 9w, and then tried 13w, and that only served to increase the algae's spread. I tried major water changes, even at one point totally removing almost all the water and replacing it. This only resulted in adding a brown algae bloom to my issues. I tried diy co2 which helped the plants increase their growth but didn't slack on the algae at all. Finally when all of my plants were dead except one part of the java fern and one tiny polysperma plant, I removed the florescent lights and put two 15w incandescent lights in since I thought the battle was lost. Then to my surprise, the java fern started to really take off. It doubled in size in a few months. The polysperma also started growing, and even though the leaves weren't the verdant green that they were before, at least it wasn't dying anymore. Another tiny polysperma plant that I figured was too small to take root, also started growing.

So then I thought - great, my algae problem is finally over! I switched back to florescent lighting, starting off at only 6 hours a day to see what would happen. Within days the algae was back again but not with quite the same vengeance. I scrubbed and scrubbed and fought it this time but again it seemed like a losing battle. Then, I came across a study that said that high phosphate to nitrate ratio can cause issues with bga. So I got a phosphate remover and added it to my filter. Now it seems that I finally have everything under control and I can even have my light on for 8-10 hours a day (yes one light, I'm still afraid to use both).

So what I want to know is this: Is phosphate present in tap water? What else could cause bga issues of this magnitude? Also, how can you tell the difference between regular green algae and bga? I have some algae on the glass now and it's not growing fast, I would like to know what it is. Another question I have is, has anyone done co2 using paintball cylinders and if so how did you hook it up? I totally LOVE aquatic plants in fact even more than fish sometimes. My dream is to have a 90g filled with all kinds of plants. (I think I have fish because I don't want to look stupid having just a tank full of plants. No offense though.)

Just as a sidenote, my tap water here is about 6.6 pH out of the tap, NO KH or GH at all. I use a few small seashells to add buffer to the tank water. Also the tap water here has a yellowish brown tinge on it. Since there's no GH I'm thinking tannins maybe? Or could it be some mineral?

 

Hi,
Thanks for the info. I did a bit of reading and from the sounds of it the basic idea of the estimated index is just estimating how fast your plants are going through nutrients and then dosing that much or more every day or few days depending on tank conditions, and doing big water changes to avoid build up of excess nutrients. Do I have this straight?

So this might be a dumb question but where can I get these nutrients? Are they sold under other names besides aquatic plant fertilizer? I guess I need KNO3 and PO4? The only plant fertilizer I can get at the pet store here just seems to have lots of iron and trace minerals, but I would need to have the basic nutrients seperate in order to dose appropriate ratios of each. Does regular (out of water) plant fertilizer work too?

A cleanup of my tank isn't really necessary at this point, it's doing fine as it is now. The phosphate remover has pretty much eliminated my overgrowth of algae but obviously it's eliminating nutrients from my plants too.

So I might look at CO2 in the future but it's a big investment for just a 10 gallon tank. DIY did not work well for me, too many pH fluctuations and it backed up into the tank once.

 

Hi,
Thanks for the info. Yes I plan on building a new tank this summer if I get the chance, I'll invest in some better equipment then. I am in Canada, are there any mail order suppliers that anyone can refer me to?

 

Great, I'm going to check out that site. Does anyone know a good place to mail order plants from in Canada?

Also I'll be going to the big city this week, maybe I should stock up on some more plants when I have the chance. Any suggestions for a 10g, low light and little expertise? Preferably something with leaves that are easy to remove algae from? And something that's pretty widely available since I don't think there's a huge selection? By the way I took out the phosphate remover, because my hygro is suffering a little. It's looking funny on the edges, probably starving now, poor thing. And I'm going to get my hands on the Flourish Excel too plus the other ferts when I can. And another question, how full should I stock my tank with plants? Right now, I have two of the hygro plants, one is maybe 2/3 of the way to the top of my tank and the other is maybe 1/2, so they're not really big. I have one java fern that is pretty big, taking up maybe 1/3 the length of my tank, and numerous other little java ferns that have come from the big one and are slowly growing.

 

Hi,
I'm in Newfoundland. I'm hoping to find something for lighting I can retrofit to my hood, or maybe make a new hood since it's only purpose is basically supporting my lights anyway and if I'm junking my old light fixtures there's not much point in keeping it if I can find a better way.

So those 13 watt bulbs that are shown on that web site, the long skinny ones, are those better than the screw in 13 watt bulbs? I was kind of thinking of picking up a cheap tube type one (fixture and all) that I could install into my hood or otherwise hang over my tank. I know this isn't ideal but I think it would at least be better than the setup I have. So lets say I have an option between Kitchen and Bath, Daylight, Plant Gro light, or just a regular flourescent. I don't know if they will have any kelvin rating on them but I can look. Are there any differences that I need to be aware of? What would be best? What would be most/least likely to encourage bga?