I had begun dosing with a new product, Nualgi 2 weeks ago. They sent me a free trial test sample and I have been using it with fear and trembling. After all its new, so who knows what'll happen-my tank might grow 2 heads! Anyhow its premise is incorporating micro elements so the diatoms and planktonic life utilize it and thrive and feed the animals while starving the nuisance algaes. I had been fighting a little nuisance algae from my heavy feedings so I decided why not try this-nothing ventured nothing gained. Yesterday was my 3rd dose and today I noticed my 2 patches of hair algae were easily brushed off the rock work so maybe it really does work. My parameters have been pretty consistent so the tank seems back to a place of stability, even though I treated with the Greenex for a week. All in all I am a happy camper, I mean aquarist!