Tank Update

[Delphinus]

I don't know if you saw my posts in the main forum about my feelings on swing-arm hydrometers ... I don't have 100% trust in them. Mind you, their error tends to be consistent, so if you know it's reading "0.003 low" then it's safe to assume that it's "consistently 0.003 low" so just add the 0.003 to the reading and THEN you're set.

Figuring out that error though is the hard part! You have to have a hydrometer you can compare to, whose values you trust as "100% correct."

I like the glass bomb types, even if they're cheap, because they go down to 1.000 -- so if I get a 1.000 reading on freshwater then I'm happy. Not a perfect validation, mind you, but better than no validation at all. My swing-arm type only goes down to 1.010 -- so I have no means to calibrate myself to it. Maybe there is another swing-arm type that does do down to 1.000, just not mine.

Maybe as a club project we should all bring our hydrometers! And see what kind of range of readings we get. It might be a real eye opener (or not ... but until we try we won't know!)

As for corals vs fish first .... In my 75, I seem to be putting my corals in there first. However I'm not sure if it matters one way or the other, but I think I'd wait about a week in between new additions, just in case you do spike your system. A few frags, though, shouldn't really spike the system, so I don't know if that would count.