What kinds of fish do you have in your main tank?
i would say so that they're big enough to not fit into the biggest fish's mouth thats what i am going to do with my guppy fry
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unfortunatly they can fit in biggies mouth he is a goldfish and since being rehomed in the new tank he has grown to be about 4 inches his mouth is huge... i know that goldfish dont normally eat fry(not that i know of) but he eats everything and anything
I'd seriously get him in that pond, he will eat everything else tbh and I'm assuming your tank is under 75 gallons so please put him in the pond next summer (otherwise he will freeze)