Green Glass? (2 Viewers)

[LoJenn]

Tho all parameters appear in good range, there must be some indictor that addresses a constant green algae film on aquarium glass. It doesn't seem to matter if lights are on or off. My AI lights over a 40G breeder I've set 1) 1:30 P to 9:30P, the other 4P to 9P. Both ramp up and down within an hour at roughly 30 %. LPS do well under this configuration. I've swapped out T5's with the same concussion. Have considered overhead basement lights that are on multiple hours per day, again does not seem to be the issue. Taking these factors out of the equation, is there another obvious concerns I'm overlooking? Inquiring minds want to know. Thx again for your help.

 

[ichthyogeek]

How much external light does the tank get? It could be that it's not the lights over the tank, but lights that are around the tank.

 

[Jposch]

Probably silicate. Comes from rodi, aome low quality pellet foods, and when sand dissolves, it releases silicate. My DT is like this. I clean the glass, and the crap grows back in a day. I never change water in that tank, nor have any real filtration. When I do actually change water and vacuum the sand, the glass stays much cleaner, longer. I've also gotten far better with not having excessive silicate blow past di resin. Everyone wants to blame lighting spectrum, as it's easy to do, but if it ever "fixes" anything, its just a bandaid. At best.