how far can i lower sg URGENT

[ClownieandBilly]

if i lower sg 1 per day to try and eradicate white spot on my tang how far can i go without harming my corals/shrimps and snails.tank is at 1.023 just now.is this possible?

[Alastair]

A lot of LFS keep their tanks down around 1.017 - 1.018 without seeming to have any problems with fish; inverts I would say seem to prefer it a little higher. However, its important to note that recent studies have shown that apparently the ich tomites aren't killed until around 1.012 or so, which I would say is almost certainly too low. Values around 1.017 seem to at least slow the proliferation, but I wouldn't count on this alone to kill them off. Don't know if that's of any help, but there it is.

[BrianH]

I would not lower your SG past 1.023. Anything lower will negatively affect corals IMHO.

Brian

[liquafaction]

my salinity is 1.021 when my tank is fully toped off. After about 1 week of evaporation it is 1.022. But who is to know how accurate my hydrometer is