I've never had MH, tried T5 which worked well then went to led. I have used leds for about 3 years now but I've never been able to keep a decent montipora forest fire, red planet acropora or a strawberry shortcake acropora. I'm really considering trying MH to see if they make a difference. Any suggestions for a 900mm X 500mm X 600mm tank?
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...so we are talking like 30x20x24, right? If so, I would get a pair of 150W HQI with 14K phoenix bulbs and M81 ballasts. Only 325W, or so, of electricity, very little heat, great color and the bulbs can be used for 2 years. These are oft overlooked, but great smaller/shallower tank lights.