my fish is dead my tank is 350 lires in there r parrot fish angels &silver sharkes &catfish & plecks &mollys &tetrassusitna-flower said:Tell us more about your tank, the size and what you have in it. Have you had it up and running for awhile? If so, did you let your tank complete it's nitrogen cycle before you introduced the fish? How long have the fish been in this tank, and are they all exhibiting the same symptoms?
Read all the articles in the following link.
https://www.fishlore.com/Beginners.htm Have you tested your tank water for ammonia, nitrites, and nitrates? If so what are the results of your tests?
Are your angles in with any other fish, and if so what kind. How many fish are in your tank?
All this information will help the folks here get a better feel of what might be the matter. We really do want to help, just need a little more information.
Fish in the Frozen North 8)