Posted: Fri May 01, 2009 2:11 pm
It's great that you could take the RES out of a bad situation, and it's totally understandable that you wouldn't have everything you need right away.
I equate Eheims to the Mercedes of the filter world. They're supposed to be high quality. They're more expensive, of course, but I don't think I've heard any complaints from Eheim owners.
Since, as Kat mentioned, you'll need a monster tank, I think you're eventually going to need 2 filters to do the job, or a pond filter.
Myself, I've got two Fluval FX5s. I haven't seen anything else in the canister filter world with higher gph. They've got some nifty features. I use one each in my 75 and 90 gallon tanks. With multiple turtles, you'd probably be able to get away with using an FX5 in up to a 150 gallon. But remember, 4 turtles means 4x the mess!
I don't think there's a filter you can get that will work in your current tank and in a new monster tank. The FX5 would turn a 30 gallon into a blender! A XP3 would be OK in a 30 gal, but you'd probably end up needing more filtration in any new tank you get.
Whatever filter you decide on, you'll want to get something with at least 3x the gph of the size of your tank. With multiple turtles, you'll be better off with at least 5x the gph.
If you don't think you're up to the challenge of 4 RES, you could look at rehoming a couple of them. Sometimes you'll be able to find a good new owner locally. If not, there are a couple of rehoming sites, or humane societies that will take them in.
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Frankie, "Young at heart."