by Saltwater Smarts | Aug 14, 2016 | Fish, Reef, ScienceQuestionThis is probably a silly question, but should I rinse frozen food before feeding it to my fish? I usually just thaw the food in a cup full of aquarium water and pour it right in.” – Submitted by GMan Answer Here at Saltwater Smarts, the only silly question is the one left unasked (well, that and “What can I take to cure my kleptomania?”). Besides, I’m sure plenty of other folks out there are wondering the same thing. As is so often the case with questions pertaining to this hobby of ours, my answer is, “It depends.” Many frozen foods contain a lot of packing juice (you’ll see a cloud of the stuff in the water right after feeding) that will serve only to introduce dissolved nutrients, degrade water quality, and fuel algal blooms. So I will usually strain and rinse them in a fine-mesh net before feeding. Typically I do this over the sink under a stream of RO/DI water, but you can also put the portion in a cup with a little water, wait a few minutes for it to thaw, and then, with the net held over the sink, pour the contents of the cup through the mesh. After rinsing/straining and while the food is still in the net over the sink, I also like to apply a little gentle pressure (not squashing it) to the portion with the back of a spoon in order to squeeze out as much extra fluid as possible.