I have very minimal experience with canisters so I am not the best one to ask. We do have many knowledgeable people here that can answer though.
Just an up date I got rid of the ich with two treatments, higher water temp and a parsal water change. I got home from work lastnight to find my freshwater dolphine being pulled under a rock. The eel had it by the tail and already bit it in the stomach so needless to say it died. Then this morning I found a head of a mollie and half a bala shark. I was told these are not known to be fish eaters of big fish. I think I have a monster. He stays out of ider alot more now but he is killing every thing. I only have my flounder, a few mollie / platties, GSP, 1 bala shark, and that stugion looking thing which I have to post a picture of for positive ID. I want to put bigger fish but scared too.?.?.?
Might I offer a suggestion on filtration. Instead of looking into multiple canisters why not consider a wet/dry unit? If you're not concerned about looks (it can sit under your stand) you can build one for less than $30 and all it take is a large tub (like a storage tub) or even a fish tank that is pretty big and a couple buckets. After that you need your filter media (generally bio balls but there are others), a return pump, and an overflow. Don't be intimidated by it and feel free to ask how to do it.
If you don't want to mess with that you can always buy one and they offer very good filtration for larger tanks, not to mention a place to put your heater and stuff so it isn't inside the tank and easy access to water to add to the tank or do parameter testing.
Isn't that the same as what the SW people call a sump?
Basically except for one difference. The bio media isn't completely submerged. The water drips over it. Take out the bio media and it is magically a sump =)
Ok, now I'm intrigued. Can you point me somewhere to get more info, like pros, cons? I'd hate to pull this to far OT but this has got me curious.