Sorry it took so long to reply, I was having health issues. I will be having goldfish. I figured out basically everything for the sponge filter and the only issue I'm currently having is that the powerheads (still haven't picked one out) have their GPH
marked at 0 ft and I'm not too sure what size of pvc to get without slowing down the flow.
I could technically use only one powerhead seeing as I found a few that are reasonably priced but the amount of sponge I would need for it is a large amount. Woud have to compensate by adding more than one pvc
pipe which turns into huge GPH
So I'm still going with 2 different pumps of 500 GPH
(still don't know which brand) and I'll need approx. 4X4X4 sponge to accomodate it so I'm going to use a 10 PPI for wastes and a 30 PPI for great BB amount.
Don't ask me how but somehow I found out the amont of sponge I would need per gallon.
Getting the sponge from swisstropicals.com any help on the pipe size info would be great. The only resource I could find was pipe sizes used in DIY refugium that said a 1" PVC
will have a flow rate of 600 GPH
so I'm guessing that's what I would be using.