Mikaila31
Always Watching
get rid of all the goldfish period.
+1 well saidQuestion: it sounds like you fished some of the babies out of your pond and brought them inside? Why? If you already have them in a pond then that's the best environment for them, and you should leave them there.
I think you should put the goldfish back in the pond, all of them, and finish your fish in cycle with the minnows. Smaller bioload will be easier for the filter to handle. Get your heater out of the attic if necessary and put some fish in your tank that are actually suitable for a 100L, even if it means taking the minnows to a shop and swapping them for something else. But whatever you do, the goldfish belong in your pond, not in your tank.

Can you post a piccy of your unknown fish?
but then putting them back into the pond will probably make them ill again if you dont lower those levels.I think they meant they've no driving license so can't deliver them to anyoneYou dont need a license to sell on goldfish,whether the fish are cute or not,in the long run if you can't keep up with their care then they will be dead fish...
that's very good news!