ok, here's the situation. My sister's (yes the drama continues) FW tank has been fouled. Apparently, she had a friend of hers and her 3 year old son visit for the weekend up until Tuesday sometime. Long story short, one of the days during the visit, the mother asked my sister if her son could "feed" the freshies..... my sister told her no, that they had already eaten. This is a 70 gallon, and had 2 columbian sharks, 2 pictus, an albino irridescent, a pleco, and several danios..... not my favored choice in stock but also not my tank, and so it goes. Anywho..... I'm not sure how long she "didn't notice anything obviously wrong" but when she got home from work last night, she ran down to my place, freaking out, saying that all her FW fish were dead or dying. I asked what happened and she said it looked like the kid had emptied a full can of food into the tank.... UGH.... MAJOR PROBLEM!! So I ran to her tank to take a look and sure enough all floaters except for the pleco, a danio, and the irridescent (he's only 3 inches for now). Immediately, I grabbed the python to get that water and gunk out. Looking at the irridescent, his gills were bright pink and skin was pinker than normal. I told her to get him out and put him into my 55 gallon. So, I pumped about 80% of the water out (left the pleco and danio) and replaced it with clean water (with conditioner). It still has some gunk settling to the bottom of the tank so I suppose I'll do another gravel cleaning in a day or two. My question is this, the irridescent is showing no ill signs except for his coloring and gills (which I'm supposing is a burn), is there anything else I can do for him other than keeping him in my tank for a couple days until her tank is back in shape?