maybe if you wrote about what you heardI heard that there are some ferts and other chemicals that can hurt inverts.
instead of what you already use, we can
address your specific concerns.
generally, shrimp are sensitive to sudden change,
so anything you use gradually and in moderation
should be fine.
some avoid CSM+B powders known to include copper.
always avoid so called algae destroying chemicals.
usually, threads that become stickied
are started and moderated by someone
consolidating a solution within a thread,
not just asking a question that a few
minutes of searching could answer :icon_roll