So I rescued 9 otocinclus catfish. I really did not want them only ,as I know they need soft water. But this guy was literally flushing his fish down the toilet, when I went to take a few of his other fish. Believe it or not all 9 look really good fat bellies. He has hard water also so I am not sure how he managed to keep them alive. He says he has done nothing to his water. I honestly have no idea how to even believe what he says. So please advise me. I would appreciate it if the advice is kept polite as I have read up on them and understand they need soft water. I took them in, as I thought that would at least be better then going down the drain. I have longfin cory's and a frontsoa in the 120 gal tank they will go in after quarantine my corys have done wonderful and even have had babies so much so I have had to rehome some. My quarantine tank has plenty of algae and live plants in it . We are in the process of setting up a rain barrel to use for water changes. Is there anything else I can do to help these guys fit in and thrive in my tank. I do weekly water changes of 35% and all my tanks have good strong water flow. I keep tanks at 72-74 degrees .
Thank you
CJ