I just scored a 135 gallon tank for a dollar a gallon ($135

), and will be setting it up a few months from now when funds are more plentiful. I have always liked the waterfall filters because they add bubbles to the water as well as filtering it - I was wondering if two AquaClear 110 filters would be adequate for the setup? The product sheet for the 110 says 500 GPH, but from my experience in the past this will probably drop to 200-300 GPH once the sponge has had some use. The 5x rule places the requirement at 675 GPH, but that is also the "new, unloaded, and media-free" rating that is given on the product box. Do waterfall filters slow down much more than canister filters? That is, will a 500 GPH waterfall filter be comparable to a 500 GPH canister filter?
I will turn the entire top of the tank into a basking/land area using light diffusers, so the tank will be filled to the top.