I only have about 5 fish left in my 29g, the tank looks empty. One of my fish is on the verge of death, the ich has seemed to blind him (maybe it was the treatment I'm not sure.) but he's looking terrible so idk how much longer he'll make it. The 2 platies that I have left just lay at the bottom all day. I brought the temperature up to around 87 degrees (very slowly) & I'm seeing no changes with my fish. I want to restock the tank ASAP but I'm sure with this terrible ich there's some preparation that I need to do. Assuming all my fish pass away, what can I do to add new fish?? 100% WC of course & just clean out all the gravel? Should I replace filter media or no?? I really want to try to avoid re-cycling the tank if possible as it's been established for a very long time. Also, for the time that I don't have fish in there, how can I keep the bacteria alive? I do have 3 snails in there (they don't seem affected by the ich or medication) but I don't know if that's enough to keep the cycle up & running & the tank is also quite thoroughly planted.