Black Fuel Filter

[smorgan87]

More than likely algae. Go to oreilly and get a cpl bottles of killem algaecide. Add about 6oz per tank while filling them up. Park it for a cpl days. That stuff is a bitch to get rid of. Add about 2-3 oz per tank per fillup after the initial treatment till your filters clear up then back off to an oz per fill up. Its an expensive epidemic. Trust me dont slack on treating ur tanks after the first just because the filters are lasting an extra cpl weeks.