Stock (now that I've actually used a tape measure rather than eyeball them) would be a 7 inch oscar and roughly 3 inch JD (the JD is currently 2.5 and thus still bite size, so I have to wait until he's bigger). No live plants, and will be using a mix of PFS and blasting sand for the lovely look they combine to make. What brand and size of canister would be the best choice? I've only ever used HOBs and am used to getting roughly the next size up for my tanks (like an AC 110 for my 65), how do you do it for canisters? Also, I love how you can chose your own media for canisters.... but how do you know what you need? Can I get tips on how to add a prefilter too? I've read that those help keep canisters a little cleaner.