<a href=showthread.php?s=&postid=11643017#post11643017 target=_blank>Originally posted</a> by reefkoi
Sounds good Steve, you'll be happy with the 30" tall, I like mine and would only go a little taller but not any shorter.
400's will be fine intensity wise but I think you'll find a low par towards the edges of the tank and some shadows in between.
You may have to raise them up to get the spread, If I was going to do 400's on a tank like this I'd think about doing 6 instead of 3 and use the smaller reflectors like the stealth or mini.
As far as the reactor goes, i have a PM 622 and its only rated for 500 gallons I think and I have over 100 sps corals and some large clams in my 600 and I have no problem maintaining calc and alk with it and no kalkwasser or 2-part needed.
C