how long does thawed out frozen shrimp stay good?

I just got my first few fish and bought frozen mysis shrimp to feed them. The block of shrimp is way too much for my 2 fish, so I thawed out a block and soaked it it garlic for about an hour then fed some to the fish. I then stored it in a capped specimen conainer in the fridge and have used it for the past 3 days. If I keep it in the fridge, do you think it will be ok to use for the next couple of days?

 

FWIW, I dont think fish react to left out shrimp the way me and you react to it. That being said, I used to make my own concoction of food mixing in freshly chopped garlic. I would have to thaw out everything to get a well mixed batch. After a complete thaw and mix, I would refreeze everything ito cubes. If you are worried about it, freeze it again, and cut off little chunks when you feed.