I got a new betta a week ago, and he has yet to eat anything. He seems to have a bit of fin rot - tail has pinholes, edges are ragged. Also noticed tonight, he seems to be losing color a little at the base of his dorsal fin. He doesn't seem as alert - hangs out on top of the heater a lot, seems to be sleeping.
I have a 1 gal tank, and i've been doing 100% changes every other day and 25% changes on the days in between. I've put 1/2 tsp of aquarium salt in. He's refused all the pellets i've gotten him (Tetra and Top Fin, which the pet store said they used.) I have a mini heater that keeps temperatures around 75-78, and a small fake plant. The pH is slightly low, the test strip says around 6.2.
Is the lower pH a problem? I'm mainly worried about his lack of appetite - should I try feeding him bloodworms? Is 1/2 tsp of salt for a 1 gal enough? The internet has conflicting info. I don't want to kill him, this is my first attempt at having a fish since my unsuccessful attempts as a child :(