To those who stick foam over the outflow...
How long have you been doing it? 2 years
Have you ever had a problem? Like cycle break down, overflow on the filter, etc..Nope, I dont use cartridges, only foam so I stick it at the out flow and inside the filter where the cartridges go as well. Every now and then If I dont swish the sponge around in old tank water, it gets clogged and I get a trickel of it overflowing
I've always read you're not supposed to put anything over the outflow.. that you should only put sponges UNDER the outflow to reduce the current of the outflow but nothing to actually go over the outflow that would reduce the flow rate.. Never heard that before..it has yet to cause any cycle crashes or anything like that and I have 5 filters that have sponge over the outflow
. Wouldn't it provide another place for bacteria to grow
? The only thing I can think of why it would be bad is if people are using the current of the outflow to add oxygen to the tank for fish that dont have a labrenth organ...?
Mine are also like this or very similar - depending on the filter brand. NOT MY PIC
, but I have essentially the same thing for my Aqueon and Aquateck filters.