so i made myself a hood for my 40 gal...

[sager303]

....but i realize it is dam near air tight. so any ideas to how many speed holes i have to add for proper airation?
actuially i want to add a breather hose to one of my powerheads will that be enough?

 

[acrylic51]

Just put some 3" or 4" holes in the back or side to mount cooling fans too.....I don't understand what you mean by adding a breather hose to your PH....If your talking about running a hose from the nozzle of the PH and the other end out of the water I wouldn't do if it's a reef tank