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35 galloon fish Tank2007-11-24 23:09:22

I have a 35 gallon fresh water aquarium, it has one sliver dollar in it, two angle fish, one beta shark, one mini cat fish and one bottom dweller. It has a duel oxygenation system, a filter, various fake plants, etc. The problem is the underside of the aquarium light hood keeps getting green from algae and the water is never crystal clear anymore. I know about checking the

nitrates, and ph balance and that when you clean the water you need to leave some of the old water at the bottom so that the ecosystem doesn't get messed up. Anyone have any suggestions as to how I can make the water crystal clear again (I suction the rocks about once a month), and how to keep the underside of the hood from not getting green all the time from algae. I was also wondering how many more fish I could possibly add to the tank, what other fresh water fish are compatiable, etc.

Answers:

The green stuff comes from the ratio of nitrates to phosphates and the overall level of both. Your phosphates or nitrates are probably high. More than 1.5 ppm of phosphates is enough for this stuff to grow and probably 15 or 20 ppm of nitrates is enough for this stuff to grow. Both chemicals are removed the same way. By doing more frequent water changes, reducing the amount of left over food, and reducing the bio-load of the tank so there isn't so much organic waste decaying.

The stuff is called cyannobacteria or cyanobacteria. It looks like algae, but smells much worse.