Howdy folks,
I have two comets both female and a male common yellow together. I have noticed in the last two mornings that the smaller female comet is being chased incessantly by the canary. I took pity on her and put her into a breeding net for a while to give her a break. However, same thing again next morning. I assume this is spawning behaviour? Prob is although I have two other coldwater tanks ther's no room to rehome her. Is this behaviour doing her any harm or couild I just leave them to it?

Maggie,
I'm afraid you would seem to have a very amorous male Golfish there, constant attention given to one poor female in a small(?) tank will cause her great stress, but it's that time of year again and since the poor males only have a short time to 'do their thing' in they need to strike while the iron's hot...just a suggestion, are the other occupants of your alternative coldwater tank about the same size? Perhaps if you can bring an obvious female from there to accompany your two comet females and bring the frisky lad into the other tank at least she'll get some peace.
Male goldfish are most persistent and can cuse great grief to females at this time of year, even in a pond. I once had a male goldfish breed with a female Rosy Barb, he wasn't taking 'no' as an answer either!
If you must separate one into the net, and I wouldn't recommend a breeding net to house a goldfish, put the male in there, at least for short bursts to give the poor females some peace, however briefly.
John

Thanks for that John, it has settled down but I have decided to buy a bigger tank and put all the testosterone(?) in there.