Saving my ngelfish from the bronk of death please help

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Trying to think of place to put him, but worried about stressing him like with temperature and stuff. Having my sister keep him upright right now, he's in a fairly large plastic Tupperware bowl
 
Took a heater out of another tank put it in my 15 gallon. Gonnna be awhile until in heats up. Only 2 silver mollies and some ghost shrimp in there right now those can be moved. Should I do some hot water changes to speed up the process?
 
Right side of his body really swollen. He seems to be able to use his pectoral fins for locomotion, a little. The 15 gallon he's going to soon has 2 sponge filters running on air pumps so tons of aeration. His fins are so torn up...
 
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