Hello all! I'm new to this hobby and so far I love it even tho I had to recently learn the hard way on why you can't just dive in without precaution! My husband and I thought we were doing everything correctly because we were listening to the "saltwater girl" at our lfs (she does know her stuff but didn't fully advise us on some things)! First, we didn't have a QT (didn't research and weren't informed) street our tank fully cycled we were thrilled went to LFS and bought a black clown, waited a few weeks and went back and bought a few coral frags and a cute little occelaris clown, waited about 3 weeks and went back in, they told us they had a shipment coming in the following day with some awesome fish coming in, we asked them to hold an anemone, a coco worm, and my husband would be in the next night after work to pick those up and look at the new shipment, my husband ended up coming home with the following: a lion fish, long nose butterfly, bi color Angel, the anemone, the coco worm and a pistol shrimp! My husband had concern with the lion fish however was reassured that he wouldn't eat anything in our tank! So he brought him home, We acclimated them and tossed em right on in! The angel and butterfly hadn't even been taken out of their shipment bags before my husband brought them home! No quarantine at the lfs, no quarantine at home, due to our lack of knowledge being newbies and all, needless to say the poor fish didn't even last 2 weeks in our home

and I believe it started with the butterfly! I started to notice white specks on him (we have had freshwater aquariums before and had dealt with ich once or twice) so I had my husband swing on in to the LFS and pick up the treatment that our "saltwater girl" recommended! Oh and btw the lion fish ate our cute little occelaris clown

after about 2 days of treatment the butterfly looked considerably better, white specks were disappearing, but then the anemone started to slime and folded himself inside out?! That day, the specks on the butterfly were back and we're worse than before and his eyes were cloudy! I also noticed the black clown had the cloudy eyes but no specks?! Then the lion fish got the cloudy eyes!! Uggghhhhh
So I researched... from everything I read I was sure it wasn't ich at all, it was marine velvet! I continued the treatment because it was good to treat velvet as well! 2 days later there was no improvement! So I got a hospital tank! Set it up with hypo salinity, Did some fresh water dips on the fish then put them in the hospital tank! Within hours, 2 of my fish were dead!!! Freaking out, my husband insisted we put them back in the DT, so I listened! Within 30 minutes the angel was done

the other 2 seemed fine, the next morning the butterfly was floating

grrrrrrrr I have 1 fish left and he is getting the cloudy eye

however I have continued to do my homework and realized our filter was carbon based, killing of the meds we were treating with! So today I took out the filter and am continuing treatment!
So far all of the corals and inverts are doing fine! Hopefully I can get this turned around!
So my question now is, would treating my DT with hypo salinity be okay?! I don't want to move this little fella and stress him even more than I already have! I know I cannot treat with copper as it will kill everything in my tank besides the fish!