I am starting a new 20 gal reef tank and I am looking at purchasing the new viper hqi clamp on metal halide. I am trying to figure out if I should get the 70 watt or the 150 watt. Any suggestions? I forgot to add that it is a deep 20 gal tank.
I had this problem with my 125G. The temp swing was from 78-83 degrees. I used a big fan to blow across the top of the tank, now it stays stable at 78-79 degrees. One more thing, let it run with the fan and find out the highest it gets and set your heater for that. A 2 degree swing is about the minimal you want. I have my fan on the same timers as the lights, so I don't have to worry about it running all the time, or turning it off.Rambo64 said:The only thing that worries me about the 150w (which is the one I think I should get) is the possibility of the light really heating up my tank