ilovemypets82 wrote:My mom has helped my bettas many times. Sometimes they would lay on their sides too. It depends on your fish's age. If it's over 1 year of age it has a chance of dying, though look through your store for betta meds.
Betta fish can live 3-5 years when taken care of properly and theres been plenty of reports of them reaching 7 or so. Really, nearly all the males found in pet stores are old breeders and already over a year old, easily.
@OP: Honestly try to dose the tank with some aquarium salt and see if it perks him up. Is he still eating properly? If you've noticed, hows his poops? Do you know your water params?
A side comment.. Vets really do not treat your typical small tropical fish. Many vets do not even handle fish at all. The fish that common ARE treated are the much larger ;monster' fish and those found at actual aquariums/water parks. Besides, actively taking a fish to the vet is probably FAR more stressful and potentially deadly then much you could do at home. Stress is one of the ultimate killers, besides poor water conditions, and should be avoided when possible.