Think the fry would just get eaten. Most fish like free snacks like that.
I don't know the specifics of all that. Or hiw fast they grow. I just know thats what often happens! Might be best to seperate the fry to a growout tank and avoid the possible issues altogether.But do they grow quickly to get to a size that the goldfish wouldn't eat them and I read that loaches have a barb/spine that thye use in defense is this not in hillstream loaches or does it not really work while being eaten?