I have two q tanks, a 10gal and a large plastic container that I use for baths and if I need 2 q tanks simultaneously. One of my new Platys has gill flukes (or something similar) and I'd rather not treat the entire main tank because the other ones are perfectly healthy, and the tank runs on a sponge filter which makes it just about impossible for me to remove medications (can't stick carbon in the filter). Both the 10 and the plastic container are dirty however...the 10 is very dirty and needs to be drained and given a big cleanout/disinfecting since I had a very sick fish in there (who died a couple weeks ago), but the plastic container just needs to be disinfected after using it for epsom baths. Basically it would be a lot less work and a lot quicker to use the plastic container as a hospital tank for the Platy. But I wasn't sure if it can be bleached or not...will the bleach soak into the plastic or anything (it's just a clear Rubbermaid-type storage container)?