A couple of questions about co2
I have a DIY co2 system on my 29 gallon aquarium. I have the co2 tube hooked up to the intake tube of my filter. At first I say little bubbles come out of the output of the filter, but since the system has been running for a week I haven't noticed bubbles escaping the filter, could this be because the bubbles are getting stuck in the filter sponge and getting better absorbed?
I also notice this whitish bacteria stuff on my filter sponge. It looks like thick globs of beneficial bacteria, except its kind of whitish gray. What could that be?