I have been battling this algae for quite some time. It started when a family member was leaving the light on all night plus it's in front of a window. So I fixed the light schedule to be on 8 hours or less and put a black background on the back. The algae went away slightly but I'm still seeing a lot. I've tried spot treating with peroxide but it didn't do much. I've also been removing plant leaves that have algae but now my jungle vals are so pitiful and small and still have algae growing on them ? I also have quite a bit of green spot algae or something similar all over the gravel. I want to replace with new gravel or sand after I fix this issue. Its a 55 gallon tank with 2 angels, 3 mollies, 1 betta, a pleco, and some pond snails. It has just a basic stock light fixture which I haven't changed the bulb in a while so maybe that is causing some issues? I've been changing water 50% twice a week with slim to no results. Help please!