live rock

[Fish_fanatic]

Can 1 watt per gallon support live rock?

General rule of thumb is 3 to 5 watts per gallon IMO for any tank with LR.. Some may differ in opinion.. But 1 watt is IMO not enough to support the microalgaes that grow and need light... The bacteria that forms in and on it do not care about light so the usefulness of the rock will not be affected...

[possum]

FWIW i have 1 wpg on my 125 and the corralline algae is growing constantly and I have noticed that there is alot more red than purple now too

Red, green and some other colors of coralline will actually grow in lower light set up quite well. The "prized" purple coralline will not.

Cheers
Steve