Frozen daphnia be may too big for ur fries and they tend to foul up water fast. In fact, you should only consider using them if ur fries are in a bare-bottom tank.
Try to use either BBS or live daphnia. For BBS, u will need to hatch them on a daily basis. Live daphnia can be bought at some LFSs and kept for 2-3 days using a large enuff tank with vigorous aeration.
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