Thank you all for your replies.
When I add the salt in the tank will the hydrometer read the SG immediatly or does it need time to dissolve in the water? How would I know how much to put in?
So, knight gobies are out of the picture then. Would 2 or 3 bumblebees be a compatible number for the tank?
I'm also attracted to dwarf puffers so I'll probably make another thread on the puffer forum.
Are nerite snails hermaphrodites? I'm not really up to having a bunch of snails in my tank unless I get a puffer.