how much heat?

[Dan Binderup]

Hi.
I am about to start a 300l tank with 130l sump.
I am going to run 1x250MH and 2x 24 T5. this I going to be in a closed canopy.
my question is: Is it necessary to install fans in the canopy, or would it be enough with vent holes?

best regards
Dan Binderup

[frank2926]

You will want to add at least 2 fans IN a closed canopy

[Savas]

Completely agree with frank - you need two fans. I would have one intake and one exhaust.

[snorvich]

+1 on that.