>>5043575
It takes time for plants to lengthen out their root systems and begin serious growth. They aren't really able to use fertilizer after immediately being put into a tank. There's also generally a little bit of shock that delays their growth too from being in a new enviroment. Don't go hard with lights and ferts from day 1.

You mention some shrimp, snails and rasbora - how old is that tank? Does it have other plants that have been around for longer? Easy Green has:
>Water Soluble Nitrogen (N) 2.66%
>Available Phosphate (P2O5) 0.46%
>Soluble Potash (K2O) 9.21%
So it's definitely overkill if the current plants can't handle it without nitrites/nitrates spiking. Better to use a fert without nitrogen for the first few months. Don't worry too much about the water changes, just continue to test and change as needed. If you over-water change then you'll swing the other way and deprive the plants of any nutrients at all (given their roots are not developed enough to really benefit from those tabs just yet). This is also why people often get algae at first, they put a bunch of light and nutrients into a system that's not ready/able to make use of it, so the algae does instead.