I have my Rusty in a 10 gallon...he loves it....I also have some plastic plants and some wood (which make arches), so he can swim around and under the wood...I put his plants in the back corner of the tank so he could sleep in them at night (to get air)...nothing sharp should go in the tank ( I found that out the hard way)...he ran into one when chasing the jumbo neons and caused his right eye to go pop-eye///his eye is all better and he is back to normal....bettas also love java moss...I also have a heater, just in case it gets too cold, his temp is kept at 79-82...we have an air conditioner that has to be on because of our other 2 tanks (80 gallon has african cichlids and the 45 has south american cichlids)..their temps are generally not in the range of the bettas...I also have a AC 50. and it keeps the water nice and crystal clear....hubby named him rusty...:dance:

