400w Halides over an Acrylic tank

[bwade209]

I have a 300 gallon acrylic (1/2" thick) tank that is 30" deep. I'm looking at putting 2 X 400w in the middle and 2 X 250w on the sides. Should I be worried about structural issues in the acrylic due to the heat? How many fans should I run?

Thanks in advanced.

 

[dave.m]

I'm not sure about how many fans, but I do remember reading one guy's website (in Minnesota, I think) where the MHs melted the top half of his tank while he was away at work. Great damage to home and loss of tank inhabitants ensued.

He went all-glass next time. Some might think that an overreaction ...

I would guess that height of the fixtures above the tank would also play a role.

Dave.m

 

[etech]

you need a minimum of 12" between your lights and the top of the tank, If your using a canopy it should be open in the back , fans are also very helpful

 

[bullitr]

if i remember right vivid have 400 or a 1000 watts over their display tank!

 

[Untamed12]

Well...not over the eurobracing. Fine over a tank opening.

 

[HarrsCars]

I have 3 400's over my 300 and only 2 openings. I have them about 14-16" above the tank and they do fine. I have a fan blowing that kicks on with the lights. The center one shines through the approx. 16" acrylic section and although it is a little more shaded it does a good enough job for the sps under it. And my tank is a 1/2 thick tank.

 

[Typhon]

Like everyone said. You should be fine as long as the MH are high enough.

Just wondering what are the dimension of your tank?

 

[psykobowler]

Do open top instead of a hood so the heat would not build up. If your center brace is narrow you can have halide on top of it.

 

[usmcpfc]

I have dual 400 w over my 260 gallon acrylic tank and there 18 inches off the tank and do fine.