Too much light?

[J8851]

Is 150 watts on a 20 gal fuge to much for the chaeto? is it cooking it? is about 13" from light to were the chaeto is resting.

I put iron and tech-i in today to see if that spurts any growth

[chuck2]

I have 96 on a 26 gallon 'show' tank. . . with 16 gallons taken up by a VERY deep DSB. . . and the chaeto does fine. It packs the top. . . keeps it green all the way down to the bottom maybe 9" below. But my light is only 6" from the chaeto. 13" seems like a long way. . . I think the techno guys talk about losing half the light value every 8" or so.

[jdieck]

No it is just about right, I would even lower the lamp a bit. I have a metal halide 175 6 inches above the Chaeto. Try rotating the algae mass once in a while so the bottom is also exposed to light.

[Triterium]

I agree, it sounds very good. I had a 175 watt MH about a foot above a 19 gallon with a 6" sandbed.