So today I picked up a betta and while I was at the store I grabbed a 5.5 gallon. I had a 2.5 but I lost my other betta last night after 2 years. I put water in my 2.5 after I cleaned everything and left to eat and go to the store so the water has been sitting in the tank with the filter running for about 3 hours. My question is do I put the betta in the 2.5 or start the 5 and once it gets to a decent temp put him there? I've read about 10 different cycle guides and i'm not sure what I should do now. I have the filter on the 2.5 with nothing in the tank besides a therm, heater, and a leaf hammock. The plants are in a separate bowl but idk which tank to put his gravel and plants in to start. He's in his pet store container on my counter at the moment.