I thought all my fish were dead

but it turned out that two of the platies were hiding. I really thought I saw one belly up, but couldn't find the body later, and I didn't see one for something like three days. Oh, well, here's to small miracles. On Thursday I'm going to have the pet store check the water and if it's okay I'm going to put in some plants and get a scrubby pad to take down the front of the tank's algae, and then I'll see where to go from there. Brenda's offered to give me a sponge filter full of bacteria to help supplement mine, and some fish as well.