Welcome back littlemutt. Sorry to hear that you still have algae issues. Are you using test strips for all of your measurments? Ammonia is very toxic even in small amounts. Nitrifying bacteria should normally convery ammonia to nitrite reasonably quickly. If your nitrates are at 0 then that doesn't sound right either. It is normal to have some nitrates in your tank. If in fact your nitrates are at 0 and your ammonia is detectable then something is wrong with your tanks ability to process waste. Please take a water sample to your LFS and have them test the water and compare your results.
Have you added any antibiotics or medications to your tank? Is there any chance that any chemicals could have gotten in your tank?
What about your make up water? Are you using ro/di water? I think you already mentioned this so after I post this I will go back and re-read this entire thread.
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