[randymon]

Will high salinty 1.030+ harm my live rock thats been curing. I kinda got lazy with top offs.

[Ninong]

I guess that all depends on how much "plus" you have over and above the 1.030 specific gravity reading.

I hate using specific gravity numbers because then I have to know the water temperature and look everything up on a conversion chart to figure out what the salinity actually is in PSU (practical salinity units, same as ppt -- parts per thousand).

Average ocean salinity near coral reefs is 35-36 PSU (ppt), except in areas with heavy monsoonal rainfall. Salinity in the Red Sea can be as high as 39-42 PSU. Salinity in the Mediterranean is around 37 PSU. But most coral reefs run around 35 PSU (which equals 1.025-1.026 SG at normal reef temperatures).

Curing live rock at 1.030 SG won't do much damage to the beneficial bacteria but it could be harmful to some of the microcrustaceans and wormy critters inside the live rock. Especially if this was a sudden and very large increase from the salinity the live rock was previously in.

I wouldn't worry too much about it but you should start to lower the salinity gradually until you have it down around 35-36 PSU (1.025-1.026 SG). Gradually in this instance means over the next day or two. Just remove a gallon of tankwater and replace it with a gallon of freshwater every few hours, unless we're talking about a little bitty tank.

[Ninong]

Looks like you have a 55-gal tank, right?

Just take out a 1/2 gallon of tankwater and replace it with a 1/2 gallon of freshwater. Repeat two or three times a day until you get your salinity down where you want it. You don't have to be too concerned about how gradually you do this right now because you don't have inverts in your tank yet, except for any beneficial hitchhikers that you may not know about.