09-06-2011, 07:21 AM
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Originally Posted by charliebebop
Hi guys. I recently bought an 80 gallon malawi cichlid tank, with fish. It seems to be a healthy tank up to know - the previous owner was very experienced, but also doing everything on the cheap, which is admirable. However I'm going to swap out the sponge filter is has now for a canister (fluval FX5). I just wondered - what's peoples opinions of the best way to switch these over. I don't really want to run them at the same time - too much flow
I was thinking:
a) set up the canister, with its media baskets (eheim mech pro, eheim biomech, eheim substrat pro), then wring out the sponge into the new filter onto the bio media, squeezing as much mulm in there as I can. Top up with tank water
b) chop up the sponge and put it in with the bio media
c) rig up the new filter, but leave the old sponge floating in the tank for a week
a) is probably my favourite at the moment. What do you guys think? Any more suggestions?
I vote for option C and would wait for a couple weeks before removing the sponge or adding anymore fish.
Option B would prolly work as well, but I would still resist adding anymore fish for at least two weeks.