At the risk of being verbally crucified for ignorance....
I purchased a Betta for the family several days ago. For the first couple days we had him in one of those "Betta kits" that they sell at pet stores ... small, unfiltered, no light.
After doing some reading we decided to "do it right" and get a larger 2.5 gal tank with light and filter. Fifty bucks later....
We prepped the tank by treating the water with conditioner and then leaving the tank sit overnight before moving Thor (the fish). We made the transfer this morning and the fish seemed fine (no apparent disease or damage).
Come evening, Thor is dead. My wife and I are a bit confused and upset. :(
We've both been perusing Betta forums and can't figure out where we went definitively wrong. Perhaps the flow on the filter was too high and stressed the fish? I know the temperature of the water was not an issue, and we treated the water with conditioner before making the change.
I'd like to try again with another Betta, but we (especially my wife) is hesitant since we have nothing to "fix" to make sure it doesn't happen again. After all, the new fish would just go into the same tank.
Ditch the filter? Tweak something else? I'm at a loss.
Thanks in advance.