not really sure what happened but before I bought the Jar I had 4 clown loaches, 2 tiger oscars, and 2 crabs.... then I bought the Jar.... then I bought a Pictus Catfish... everyone was doing great for about 2 weeks... everyone was eating good... I was feeding the Oscars Hikari Bio-Gold pellets, the Jar was eating that 2 and I was throwing in some meal worms as a treat... then all of a sudden my Jar stopped eating but everyone else still had an appetite... the jar started rubbing its mouth on the glass and after a couple more days it started getting lethargic and would just sink to the bottom and stay there for a few mins then start swimming again then just yesterday morning I woke up and I saw a slime on his head and some on his body and I went to the lfs and they said that my tank has Ick... so I got the proper medicine and started treatment.... then this morning it was a dead... ooh, 2 days before I did a 25% wc and the water parameters were perfect