I can't keep shrimp for anything in my tanks ( pretty sure its our water source) what type of shrimp where they? I would do a few big water changes opposed to stripping it down or anything, if you have fish still leave them in. and dosing on the heavy side with dechlor. btw.. i also worked for petco for a few years.. and petsmart as well.. then I learned more here in 30 days then i did working for either of those places for over 6yrs combined... lol