i've noticed that my fish was extremely energetic. especially for a female one. she zooms around liek mad and assaults everything, but not in a bad stressed out way, thats just what it does. so while i was out today, i decided to get it a bigger tank. unfortunately, the space is my room is wicked limited so i could only get a 2.5 gallon tank . but its still soo much bigger then a one gallon bowl. i put little silk fake plants and a sabor tooth tiger skull cave thing in it. bagel seems to be having a grand old time exploring it and racing from side to side.
but anyway, i was just wondering if i would need a filter for the tank. i'm going to be doing 100% water changes once a week.
i do not plan on getting a heater, my room is 75 degrees or higher year round and i dont want to boil my fish. also, my fish gets bummed out in really warm water. i really have no idea why.