I run a BB tank, no substrate at all besides a driftwood piece. Running an eheim 2262 packed Eheim Pro subtrate, Matrix and Fluval bio rings. 2 x Sunsuns 402B's packed with pot scrubbers and 2 x Ac110's filled with filter floss. I do feed them Tilapia Chunks every 2 days, and i only feed them what they can eat right in front of me, never any left over. I did something different last week ive never done before. I gave them some Commet Goldfish as a treat for my bass for the first time. Maybe they carried the parasite? Anything i can buy to kill it or is not a big deal?