Looks like there was a lot more going on with Psusennes than I thought. It seems the fin rot has returned and is being very aggressive. See the first 2 pictures below. He is able to reach the surface, but lowering the water level for him means turning off the filter long term so he doesn't get swamped by current.
Ramesses is currently in an unheated 1/2 gallon hospital tank with 1/2 tsp epsom salt daily with water change. I would like to get him warmed up, but it's hard to do at that size. How would 3 tsp of epsom translate for this size of tank or should I switch them again? Psusennes to the colder hospital tank and Ramesses to the warmer main tank...would that help either of them? Two pictures of Ramesses are also included below.