Danny,
Awww...poor little Mr. Phoomps.
It's not uncommon for a fish to experience a secondary bacterial infection after being infected with Ich.
But to the process of elimination, I have many questions for you....
1. Does he showing any other signs other then behind that one fin?
2. How long has this swelling been going on? Is it growing each day?
3. Since in QT, what method of treatment are you using?
4. Did this happen after treatment started?
5. If treating Hyposalinity, what is your salinity at now?
6. Did you suffer a Ammonia spike at all after you passed 1.016? Did you check?
7. What are your QT tank water parameters?
8. Do you use tap water but condition with Prime or use an RO unit?
9. What foods do you normally feed your Lion? If silversides, how many?
10. I will also assume that you're not feeding him goldfish or other freshwater feeders? Correct?
11. Was he able to be hand fed before he stopped eating?
12. What other tank mates do you have in the QT tank with him?
13. What size is the QT tank?
O.k think I covered everything.
