Water change ??? - Shrimp and hermits in a 5.5g

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Treating my system with Interceptor so placed a cleaner shrimp and 4 BL hermits in a 5.5g. There's a few pieces of LR and a little HOB power filter.

Thinking of not putting them back in the system until finished with the treatment so wondering how much waste shrimp and hermits product (how long can I go between water changes)?

Planning on feeding only some of that tiny pellet food that came with IO mix.