So I've recently gotten bitten by the aquarium bug after about 10 years away, and just today upgraded from the 10G FW
(that I promised my wife I'd **NEVER** need anything bigger than
) to a 30G FW
that I keep at room temp. I'm only keeping goldfish now, and they seem to be thriving quite nicely.
For the new tank, I installed an undergravel filter along with a powerhead to move water through it. My question relates to the direction that I should have the water flowing. Should it be moving the water down the tube, and up through the gravel, or down through the gravel, up through the tube? The reason I ask is that it seems that it's meant to be run with water being drawn down through the gravel. My brother-in-law has a 55G FW
tank set up that has the powerheads moving the water up through the gravel, keeping particles circulating and cleaned by the external filter. His tank is sparkling, so that's the way I've got mine running right now.
So, which way should I run it, or does it matter, or are there advantages/disadvantages to each?
Thanks in advance!