Hi! New member here. I am hoping that someone on here can help me out. I am in the process of custom building a 109 gallon aquarium for my dining room. I've been trying to do all my homework before I start adding fish so that my fish will be happy. I have had freshwater tanks in the past and am fairly familiar with them, although this will be my first big tank. I think I would prefer a cold water or temperate tank, that does not require a heater, as I think that will be easier for me to manage starting out. The problem I am having is that I would prefer to have a few specimen (I think that's the correct terminology) fish, as compared to a large amount of schooling fish. I definitely want a few hill stream (weather) loaches, but I cannot find any other fish that are temperate/cold water fish that will reach 10-12" that are not goldfish. Does anyone here know of anything I could do instead of goldfish? Or am I going to have to suck it up and get a heater and do a tropical tank?