Christmas one of my Zebra Danios were missing, we had thought that another one ate it, considering this extremely aggressive fish I called AgrI was in the tank. I had only added them for a week beforehand because I was just starting my tank. The Friday after we found its carcass stuck in the plant, covered in white fungus/algea and I onlt noticed because of the black dots for eyes. We soon removed it then the next day another one must have gotten its jaw stuck open by a rock or some kind of fishy lock jaw and would not eat, we took him out and the same plant that the otherone died in because it got stuck again, my dad flushed it soon after. My mom came back home with Bubble Molly's and 2 Algea Eaters. Now we have one in a Quarenteen jug with a whitish, algae like spot on its back, we are now doign a partial water change, what do I do now? are all my fish doomed to die?