My dilemma is this:
I plan on building an ~270 gal plywood tank in the near future. I have researched it a lot and feel comfortable with the build and design of the tank itself. Its the filtration system I am having issues with.
Here are the facts:
Tank will be custom built so design is flexible.
Will be injecting CO2.
Don't have funds to purchase canister filters large enough to handle the GPH needed. ( 3 x 270 = 810 GPH)
I really really like the idea of using a sump/overflow design as I could then add another 70gal or so to the tank size. I have heard however that sumps/overflows are bad for planted tanks because of all the oxygenation caused by the sump system.
So I was wondering if anyone had some ideas about a good filter system for a large planted tank. Would a 'closed' sump system alleviate some of the CO2 loss, or is it negligible in the first place?
I have also seen a design somewhere that had the overflow built right into the side of the tank (like an extra 3-4 inches off the sides of the tank that aren't part of the view screen) and I would like to implement that if possible.
Thanks for any advice, and I can certainly give more specs. about the design so far. Been trying to create a nice MSPaint image but apparently my paint skills are... well, lacking