Hydrometer calculator(and tank specs for suggestions)

[pmob7714]

I just setup my first saltwater aquarium. Ill include the specs in case anyone has any suggestions. [Its a 29gal tank, 30lbs ls, some coral based rocks(for looks), 20watt actnite light, a proquatics canister filter for a 50gal tank and two damsels to cycle.] I was looking at this spec grav calculator, and it said that if you want 1.022 @ 77 you need to read 1.020. Just wondering if anyone has used the same one?

 

[bigbonedee]

hydrometers are generally set to give you a reading based on 75 f. So the formula is that you want to add .0007 to your Spec. Gravity reading for every 5 degreees above 75 f.