Beware of the Imagitarium parasite remedy from Petco. They say safe for fresh and salt water fish and plants, all natural. Not a medication, just something to help it heal I guess. I used it on my 75 gallon fresh water tank because one of my fish looked like it had ich after being beat up by his mate "breeding pair of Severums".
Well I used it and it killed most of my prized plecos and some other fish. I contacted Petco and got no response. I just want to tell everybody I can to avoid using this stuff. Someone asked Petco on the Q&A page if it is safe for plecos and Petco says perfectly safe. I don't trust Petco at all anymore, they just lost a customer and more if I can spread the word.
Edit; This concoction is made by Petco.