This is my first betta (aqua steve) and he has always been really active and happy from what I can tell.
I feed him twice a day with HBH Betta ColorBright, and I change the water about once a week, using Tap Water through a Britta Filter and Top Find Water Conditioner...
His tank is a 2.5 gallon tank, with rocks, fake plants, a filter (but no heater).
Anyways, I just changed the water today for the third time since I got him, and I noticed how lethargic he was acting. When I put him in a temporary tank, he sank to the bottom and was hardly moving. He was breathing heavily, and laying on his side at the bottom. Every few minutes he would freak out and appear to try to jump out of the top of the water.
He did the same thing when I put him in the cleaned tank too.
I just found out that you are supposed to use a heater with them, so I mixed in some warmer water and brought up the temperature of the tank a bit.
Symptoms include: heavy breathing, laying on side in awkward positions at the bottom, and random sporadic freak outs, where he looks like hes trying to jump out of the tank. He also just started floating at the top of the water, and appears to be eating the top of the water (maybe gasping for air?)
I will run to the pet store tomorrow and pick up a heater, and a water tester, but what can I do to keep him alive over night / what is wrong with him?
He does not appear to be bloated, but I'm not fully sure what a bloated fish looks like.
Any help is appreciated.