My German blue ram is extremely bloated and has lost all coloration. He never moves or eats now. He started acting like this when I introduced him to a new tank with 13 cardinals (who also don’t eat). As of one week later, 9 cardinals have now died off. I am thinking that it might be an internal parasite. I just started yesterday dosing with Seachem Polyguard and Stress guard every 3 days. The tank is fully cycled. Anybody have any suggestions?