im setting up a 36"-10"-17" coldwater tank and wanted to stock it with 1 black moor goldfish, white clouds and hillstream loaches. i was wondering if these fish are compatible and how many loaches and white clouds i should get
Hillstreams need a LOT of current, which fancy goldfish don't like. Also, that tank's volume is just about right for one fancy; you don't want to add much more bioload.
My suggestion is to choose one of these options:
A) Just the goldfish and maybe a small school (10 or fewer) of white clouds, with gentle current.
B) A stream tank for the loaches with high current. You can keep dace and darters in that setup as well.