Silly me , I douse the tank with diluted chlorox ., rinse with water . Then clean with straight vinegar and then rinse and then let dry. I deal with only small fish so I have three 20gallons. One is in use , the second is ready and the third is cleaned and dry ready for the next treatment. I use white and black pvc elbows of varying sizes to givea sense of caves . I do FW dips in between transfers until they don't look happy then transfer them to the ready tank. I weigh out chloroquine in batches of lowest effective dose for 5 gallons increments. So when I transfer I add sufficient packets to treat. I do wait the 72hr time to transfer. The chloroquine should be effective on any hatching or dropping ich and other protozoans. I havent used the formalin yet. And will reserve it for the clowns if they do not look good after the initial 3 days. It's not perfect but I understand that the fish have gone thru a lot. Only goto extreme treatment if fish look really bad.
