I let my diy CO2 run out a few weeks ago. I didn't notice it had stopped working for a couple of days. I started seeing algae when I had none since I started the CO2. My lights right now are three clamp lights with 20w, 6500k spiral CFL bulbs two inches from water surface. I have the timer set for 6 hours broken up into three on times so I can watch the tank when I am inside. So they are basically on for two hours at a time, three times a day. I was doing 8 hours of continuous time but shortened it to control the algae. It is a 29 gallon tank with two fish, shrimp, and snails.
Water perms from yesterdays testing are
PH 7.6
Ammonia 0 (have had problems with it off and on because of overfeeding. Under control now)
Nitrite 0
Nitrate 5
GH 143.2
KH 89.5
No phosphate test kit. Do I need one?
The snails and shrimp are eating the algae. It is slowly receding. Except for what is growing in the moss. I tried cutting out the worst but it keeps coming back. It looks ugly. I cut back on fertilizers and my plants have suffered. Started using the Flourish Complete again today and will be ordering some dry ferts I was recommended in another post I made. My plants were growing very well until I slowed down on fertilizing and my CO2 ran out. I am keeping a closer eye on the CO2.