So my mom just got me a koi fish...(I dont know how big it is) and I have been talking about getting a betta for my 10 gallon but she got the koi for free. She doesnt know much about fish. I havnt said anything to her yet but I dont know how happy it would be in a small 10 gallon.....any help with anything would be nice. This could be a great opportunity to build my own koi pond but I have to ask my dad.....lol dont know how that will go. But if I do keep it in a 10 is there any way I can keep it as happy as possible? I cant afford a bigger tank. I do have a 50 gallon community set up already im not sure if I could put it in there cause of my plants that it could potentially ruin. Could I also get some facts on koi and how tolerant they are, Compatibility, temp, feeding etc.