I believe the algae problem I was having a few months ago has subsided. Actually it seems it is disappearing at a fast rate. I have 2 Ottos and either they are doing an exceptional job or the algae is dieing off. My parameters are 25 gallon, AM 0, Ni 0 and Na 10-20. There is some brown algae on the filter inlet, motor, etc. and green growth on a flat rock near the light. I had several areas on the substrate that had growth last week but has disappeared. I added 2 new ferns about 3 weeks ago. What is happening to it? Will my Ottos have enough to sustain or do I need to supplement more with wafers, etc.?