So Loki died of undetermined causes that eventually caused him to pinecone and pass the other night. We are looking at another betta to go into his 10 gallon and I need to know if I need to totally strip his tank and start over, or do I just let it run a couple weeks and do water changes. Right now it is heavily planted and has trumpet snails, mystery snails, red ramshorn snails, and red cherry shrimp. There was never any medication or salt (obviously) in his tank as he went into the qt for that. However, he was in his tank off and on while he was sick, but not the last week when he was really ill. I don't particularly wish to strip it as it will be a pain, but I don't want to put a new fish into a tank that might be sick, either so if it needs to be stripped it will be.
The filter in that tank is a sponge filter.