Moving from 146W T5 to 346W Metal Halide/T5

[arash53]

Today was the first day of MH , it was on for an hour , wow my corals loved it specially my RBTA , only some mushrooms on the top squished a little bit.
Heat did not increased at all (my tank is running pretty hot in summer about 84 in the afternoon and 82 in the night and morning) , so far I really like this fixture

[viperfish]

If your temp is between 82 and 84 you had better get some fans blowing on that thing or you'll roast the tank when your halides are running for 6 hours!

[arash53]

Yes thats exactly what I do , A double fan blowing when the MH is ON thats why when the MH was on today the temperature didn't change.

but I am not sure if I run MH for 6hours the fan is good enough , I cant afford chiller I hope the fan do the job for summer

[Vitaminz]

I find if you have a canopy, and you build fans into it, it seems to contain the heat and expel it faster. Kind of like a heat sink in a computer... I only have the fans turn on when my MH go on, seems to keep the tank temp stable. How many hours did you put your MH on today?

Jeff

[arash53]

I dont have canopy the fixture is about 10" above the water surface , I go with 1 hour only for rest of the week and 2 hours for next week, I move the fan power cord to the actinics power bar (9am - 10pm) probably ill keep it there for rest of summer .

[Vitaminz]

Do you have a pic of your setup with the new light?

[arash53]

I'll post it when I got home today