what is MB7? i have mine running for 2 years now and no vodka dosing. Lots of mulm and lots of Scypha sponges

http://www.jlaquatics.com/phpstore/s..._ID=bw-bac0500

OK, if your not using MB7 or something like it, that could definitely be your problem. This stuff really works. Dose heavily to start off, and then a cap about once a week.

Give it a try, and also feeding into your skimmer and see what happens. Hopefully your mulm will disappear. Let us know what happens.

I dosed zeovit already so not sure if i want to dose anything else, maybe zeovit is the problem. As i remmember, i did not have the clogging problem for 6 months or so into running pellets but it is getting worse and worse now after 2 years running it.