scsinet
Active Member
I don't know what "normal" is, but if you mean natural seawater, it varies from 1.020 to 1.028 or so. Generally speaking, what you find in reefs is 1.025-1.026. Talk to any LFS that doesn't have inverts die on them and you'll find that they run at 1.025. 1.025 is what I run on my reef and my BTAs are reproducing and thriving.