Too much ??

I just bought a 150w mh with 2 t5 14w actiniscs for my 20 gal long think this is overkill ?

 

Only if you put it too close to the water.;D

It depends on what you are keeping for corals.

 

I've got a 250W mh w/ T5's over my 20 tall. No heat issues and it looks great.

 

Was figureing I could stock it with sps and use it like a frag tank

 

ya that will work fine, i use a 250w 20k over a 24g aquapod and keep zoas, acans and sps in there

 

Just right. If you are doing a frag and looking for growth alone use a 6500K bulb.