Dodo...
try this brand of medication; it is non copper based.. it is safe to be used with corals and invertebrates.... so.. it should be fine with banded cat shark.. Sharks are generally very sensitive creatures to salinity level changes.. so, i dun recommend lowering it.
Anyway, do not expect the medication to work wonders coz it can take up to 21 days for u to see the full results of the medication..
meanwhile, continue to monitor the water quality parameters.. (me assuming that u have a matured tank) and how big is the tank? does it have enuff space for the shark to go ard?? who are its co-occupants? How was it introduced to its new environment? all this factors play a part in creating the stress in the fish.. Hope that this might be useful to u.
Oh yeah, perhaps u might like to post this question at the marine forum. Some ppl might have tried other means and it worked...
David, u are a real joker.. hahaha.. adding more salt to a marine fish.. hahaha.. real joke of the year..
All the best...
Kelvin
Let us work together to preserve the world for our children to inherit by being responsible to our surroundings. Take nothing but pictures, leave nothing but footprints, bubbles and memories.
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