my tank setup is a 40 gallon tall with two 36 inch aquaticlife dual lamp t5s on it 39watts each and just a few rotalla speciaes plants in it. i have a 305 fluval filter do 20 percent water changes every week. my water tests come back just fine but i still have algae growing at a rapid rate. if i do a 3 day blackout (before i put plants in) the algae would completely go away only to come back a short time later. tank has been running for months and is cycled also and grew plants at very rapid rates. my questions are.
1 what life expectancy should i see out of these bulbs one 6500k and one 650nm
2 what bulbs should i replace these with to help aid in growing plants.
3 any other areas that i havent thought of to try?
and also if im doing something wrong in posting this take it easy on me im a newb. thanks brandon from york, pa