xCry0x Active member Sep 1, 2017 #2 I have a RSM 250 and I took out the sponge on the right side altogether and cut the left side one in half. I try to clean it well about every 2 months; ideally you do it every water change though. I just put it in my bucket of dirty tank water and squeeze it a bunch to get gunk out. Then I run it in the sink until water comes off clear.
I have a RSM 250 and I took out the sponge on the right side altogether and cut the left side one in half. I try to clean it well about every 2 months; ideally you do it every water change though. I just put it in my bucket of dirty tank water and squeeze it a bunch to get gunk out. Then I run it in the sink until water comes off clear.