Originally Posted by Mebbid
Yeah, that all makes sense. I'm still just worried about a few parasites hitching into my tank unnoticed though.
The last approach would be to give your fish a freshwater bath prior to going into the main tank then not adding any of the water you used to acclimate the fish in back into the tank.
Short of a microscopic investigation of the fish itself
, I don't think you can ever be 100% sure. Just as sure as you can be.
You have to remember that some diseases and pests live inside the fish and aren't effected by external meds or UV
but unless you are going to go through a thorough inside/ outside medication regimen, you just have to do your best and take your chances. I know of nothing but bad husbandry to instigate an issue derived from internal "bugs". Only meds to kill them while they are internal.
Hope this helps.