Your tank contains 180 US gallons of water. Multiply that by 30 and you get 5400 gallons. To keep high flow demanding stoney coral you want all of the flow that your various pumps and power-heads create to add up to at least 5400 gallons per hour. This is just a rule of thumb but I wouldn't want to be much lower. However you can certainly have more flow than that. Some people have as much as 60x in gph. In your case that would equal 10800gph.
I don't have much experience with T5 so I can't really comment. Do you know what colour temperature yours are? When was the last time you changed out your bulbs for new ones?
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