So I need to clean my filter, not necessarily replace media just carbon. Last time I changed the carbon I noticed a lot of gunk in there. I have a fluval 307 canister and I’m deathly afraid of cleaning it because of wiping out the bacteria and I don’t want to have a nitrite or ammonia spike. So my question is, is there a beneficial bacteria additive I can put it the filter after cleaning it out to help that of keep bacteria in there?