Originally Posted by Jessyka
I have a 10g partitioned tank with two bettas in it. The filter is on one side and it's too strong. Can I rig it up to slow the current (I've read about the plastic bottle thing on the waterfall and the sponges on the input. I don't understand the sponges.) or should I get two filters, one on each side? 5g on side and 5g on the other?
With the sponge, you basically cover where the water comes back into the tank with a sponge so that the water has to run through it. The sponge breaks up the current into a gazillion little currents, going lots of directions, so your fish don't get battered around. I would keep the 1 filter, and just baffle it with the sponge, it works wonderfully, and the sponges are super cheap, like $1 at the fish store. You do want to make sure you get an aquarium sponge, so it's safe and doesn't have funky stuff in it that will hurt your fish, but they are wayy cheap.