I do see a pit developing on his head but I honestly have no experience with HITH. From what I have read, there are a variety of factors such as water quality, diet, carbon, heximata, etc that may play a role in its cause. If I had to take a guess here, its probably a combination of him not eating & internal parasite issue both of which are affecting his overall health.
So, far the parasite clear does not seem to be very effective & without a qt, its a bit difficult because your other fish will have to be dosed with meds in order to try & treat. You could try treating directly with metronizadole & Prazipro instead of the parasite clear tabs. Metro is accepted for treating heximata infections although its not a guarentee. I am not sure what you have available at your lfs. Because theres numerous things going on here, we have to figure out which to address first- the internal bugs seem to be the likely root of some other issues but I am beginning to wonder if theres more to the picture than just what your seeing. Are you still treating with the parasite clear tabs? Hopefully, someone else with HITH experience will have some input on how to address this with everything else going on!
