Is it Ich, fin rot, or trauma?

Question

I have 5 angel fish in a 100 gallon aquarium with 4 Austrailian Rainbowfish, and 5 platys.

The angel's fins and tails are ragged and look worse every day. The edges are white and swollen (not red/bloody). Their bodies have salt like deposits that could be ich or injuries. I don't know which.

Is it even possible for 5 fish to be sick while the others are fine?

Other info:

The angels are 8 months old and "siblings".

The tank has been running for 5-6 years and is cleaned regularly.

I've been watching closely and can't see a bully fish. There's no obvious aggression among any of the fish.

Answer 1

sounds like ich and fin rot  well i would get some ich and fin rot remedies treat the tank for 3-5 days then do a 25% water change change the filter  and also check your water for PH and ammonia if you don't have test kits just bring a water sample to any fish shop they well test it for you  and help you with your problem

good luck

Answer 2

Sounds like fin rot, at least in part.  The white part could be a fungal infection.

I have Bettas and use Jungle Fungus Eliminator for fungus and tetracycline for fin rot.  I don't know if those will work for your fish.

Did you just get the Angels?  I find that new fish sometimes have ailments.  They aren't always kept in ideal conditions before we get them.  

Answer 3

it aint gardening