How much light?

[brucewrs]

I have a 210 with alot of live rock and alot of fish.It is not a reef tank due to alot of my aggressive fish but the rocks do have some coraline on them.What lights do I need to keep it alive?Right now I have a 48" compact with atinics and a 48" dual floresent.What is the cheapest way to get more light.Also I have my glass covers on so my eel wont come out and a regular wood canopy so I think the MH will be too hot.. Thanks guys and gals..

 

[teen]

you dont need strong lighting for coraline algae. you only need to maintain good water quality(via water changes), and you should be testing for calcium, magnesium, dkh.