I have 2 koi and a goldfish in an aquarium inside. Technically because my pond leaked too close to frigid weather and I intended on winterizing them indooors. But now I don't know if I want to put them back out! I love watching them any time of day or night. They are now in a 30 gall. but I can go up to a 55 for the space I have. Is this truly horrible? I will put them out if this is detrimental but I would appreciate suggestions or opinions. Aside from building an indoor pond (which is not out of the question) what would be the next best thing? The koi are 8 in an 5 in. the shubunkin is 4 in. My amon. nitrite and nitrates are 0 and my ph is 7.8. thank you for your thoughts