There's always been a little algae in my tank, but it's everywhere now! I leave the light on
for 9 hours a day in the 2.5 gallon tank. It has a filter and a few live plants. The algae covers the
java fern leaves in a dark green film. The algae grows in massive amounts in the filter cartridge too.
I scrubbed the tank clean just yesterday and left the lights off for the day, but it's back again!
What's causing this?? Too many nutrients?