175W enough for SPS?

[High tide]

Originally Posted by BlueAbyss

Alright I'm stuck. Again

Is a 175W MH gonna be enough to have SPS?

The tank is only a 20 tall, and I'd rather not have a more powerful light than I need, since I do plan on running them for 8 hours a day. But if I get the 30 tall which has the same dimensions but longer, I might want something more powerful... any thoughts would be helpful.

Yes, a 175w MH will be ample on a 20 gal. aquarium. Your SPS will be fine at different levels of the aquarium. The Iwasaki was a good recommendation.