ok so right now my 125 has 2 Ac110 and 2 Eheim ProII 2028. ive been postponing to add another filter to add more bio filtration. i was thinking of making a DIY sump, but my tank evaporates a lot of water so it would be tricky to get an overflow constantly going. second i was thinking of adding another canister filter... most likely an Eheim classic. any suggestions?