01-07-2010, 11:21 PM
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Just just testing the water
get used to doing that!
Depends on what type of corals you will be having and so forth. What type of 30g is this? can you give some parameters? Regardless of the depth of the tank i think that either would be ok, but you may get the better light distribution with the t5's...
I personally would go with MH ballast with some T5 or VHO actinic supplementation. That's just me personally. I'm currently using 2x175watt MH and 2x40VHO for actinics and i love the coloration i'm getting. Keep in mind that coloration is going to come from the color of bulbs you get as well.