what else do i need to check ?

[hotskate]

okay i check salinity
ammonia
nitrite
nitrate
and high range ph

 

[BBReef]

if your doing a reef ur gunna want to test your calcium and alkalinity as well, corals need them to be balanced to thrive. also phosphates if you get a lot of algae.

 

[hotskate]

not really doing a reef tank