What about somethin like 2 of these?
http://www.thatpetplace.com/ovation-1000-submersible-power-jet-filter-265gph
Ovation 1000 submersible pump filter that isnt to expensive and has good gph. I could try to put them both in the middle to make a large waterfall in the middle or have 2 waterfals comin from each bak corner
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Don't know much about that specific product but my main problem with internals is that you have to remove them from the actual tank to clean, and they can be visible in the display place if not well hidden. But if they are well hidden, if you don't do it very smartly it'll be difficult to take them out for maintenance.
And I generally prefer real wood or rock to foam, but that's a matter of preference.
I was thinking of actually building a "waterfall" where water essentially shoots down into a big complex cone shaped mess of manzanita. Then if you planted pothos on it their roots would fill it out, and it'd be like a crazy live tangle of running waterfallness. It's an idea I've been toying with for a while.
