Picasso had been sick for a couple of days. On wednesday he was not swimming up by the front of the tank and I could barely get him to eat bloodworms. He lives in a 5 gallon tank. HIs filter was very ready to be changed anyway so I changed the filter and did a two gallon water change with aquarium salt. This did not seem to help and the next day he was worse--laying on the bottom of the tank back behind the plants, barely coming up to breath, not eating, and he seemed weak. On thursday we bought a broad spectrum antibiotic and out it in.
He was still laying on the bottom, and yesterday while we were at work he died. When we removed his body from the tank it looks like he might have had a little of the gold dusting look of velvet (I think) that we did not catch before, so he might have had velvet but he was not swimming around scratching himself on stuff.....
How do you deal with a tank after a fish has died of something unknown? Any ideas what Picasso could have had? I was really upset by his death and do not want this to happen to another fish....