I bought two healthy betas last night. A large tank in on the way, shipping from amazon, with a filter and heater. At the fish store I bought a .5 gallon tank with a divider and that's their temporary home. I bought two plants, pebbles, and some medication droplets. I also put chlorine treatment in, as I'm using tap water.
They loved it last night, were swimming around, etc... but this evening it was very cloudy. So I took the fish out, cleaned it, put tap water in, brought it to room temperature, put drops in, and finally, put the fish in.
They just went from active to completely lethargic. I thought one was dying. They just sat at the bottom of the tank, would fly up for air, and sink back down. I poured out some water so it wouldn't be so hard for them, and poured some of their old water back in, hoping the bacteria/nitrogen cycle would be corrected.
I know I've made some mistakes here: my question, how do I avoid them, and how do I fix this? At the moment they are barely moving. They just sit around up top. I've put a very hot snake necked desk lamp over them, hoping to give them some "warmth" and they seem to like it?