Please help! My fish are sick! 10 points to best answer!?

[riverscuomogirl]

I have a 20 gallon tank with lots of plants in it, and it stays the temperature all the fish like and are used to. I test the ph every one in a while and its always good. I have a goldfish, an african dwarf frog, a few glofish (zebra danios) 3 neon tetras, 2 snails, one sunburst wag platy, and I recently introduced 3 black skirt tetras, and a small dojo loach.
All of a sudden, all of my fish got these white little particles on them, but i haven't noticed it on the danios, the neon tetras, the frog, the snails, or the loach. The goldfish is being very lethargic and rests on the bottom most of the day. he eats, but doesn't move alot. His tailfins are covered in the white stuff. The platy has it all over its body but its not lethargic, and the skirt tetras just have a little on their fins, but they are not lethargic either. i put aquarium salts in the water yesterday, but it appears it got worse! do i just have to wait longer for the salts to take effect?
What do they have? fungal infections? Please help me and tell me what I can do to save them!
oh, and the goldfish's tailfin is kind of ripped, it appears, where alot of white stuff is.

 

[guiltychopstick]

i C a lot of problems with this picture. first of all. mixing goldfish with tropicals is bad juju. cuz their temp range r completely different. DONT USE MARDEL COPPERSAFE! this will KILL ur snails and frog. it is not an antibiotic! copper sulfate is a very effctive chemical but very harsh on ur fish. ur tank sounds like it has ICH. ich is caused by high levels of stress which can be caused by many things like temp flucuations and change of environment. heres what i would do. use some KORDON RID ICH. and slowly raise ur temp tp 80-82 degres. make sure to take out ur frog out and maybe the snail just in case. make sure after treating ur tank to add carbon back into ur filter for one day before putting ur frog and snail back. i would slowly lpwer the temp back to 72 degrees to loqer the strss of ur goldfish. also recomend seperating the goldfish from the tropicals they maybe getting along and having fun. but i can tell u right now. this will be the first of many problems u will have in the future. ur tank is technically overstocked cuz of the goldfish. oh and also check ur nitrites. nitrates and ammonia. they maybe spiked. so plz check them cuz the treatment i mentioned earlie will be useless cuz ur fish will die from a bad chemical spike before they die frrom ich.