For survival purposes, I just want to add, make sure the fish you choose can make it through your winters without added heat. We've lost guppies here in central Florida before. One winter they were fine, the next year was colder so they were all gone.
And make sure you like the way they taste, if you could potentially be eating them for every meal! Or good for birds. I wonder if the little bones of tiny fish build up in a chicken, or if some have an easier bone situation
That reminds me...
One day I opened a big can of salmon to make a recipe for my cat.
I tipped the contents in a bowl and was getting rid of excess skin that I was surprised to find in there. *For reference, I don't eat fish products, so what did I know. And I was half holding my breath against the awful smell.
Out from under one of the skins these
things were dropping down. They were rattling and rolling all over the cutting board, dropping and rolling across the floor. It was the worst sound I've
ever heard!
They were rolly polly bones! Probably from the spine I guess.
My belly was rolling worse than the sound, pretty sure my face was green.
I thought I could soldier through... so after I chased around the awful rolling things and got them cleaned up, I went back for another scoop of skin, out out rolled more. I can still hear that awful sound... like rattling hollow marbles.