I skip "a day or 2" all the time with no noticeable change, and though I'd never tried I didn't expect so much algae growth if I let my guard down for a bit. Guess I was wrong! PO4 and NO3 barely show -AFTER dosing. An old expired Sera kit says that iron is still good, and I don't have a test for K but have to assume the macros are what have been diminished.
Yeah, that lady is one of many carrying eggs and there are a few dozen new babies too. The temptation to overdose fertilizers when something like this happens is strong, but these are shrimp, not hardy fish and I have to inch it back to where it belongs. After I start getting there, may make a custom batch or two to hit the levels that are bottomed out most.
Nothing good happens fast in an ecosystem.