i would raise your salinity to around 1.022 if you are going to do a fish only.
FISH ARE NOT FOR CYCLING. Doing that would put these animals in an extreamly toxic environment and could possibly kill them. Put in some uncured live rock or a few raw, uncooked shrimp.
Test your amonia, nitrates, ECT maybe once a week, when it all lands on zero after a huge spike, then it is safe to add fish and your clean up crew.
:joy: