Refractometer? Is that some other type of device to measure specific gravity?
Yep - this is a refractometer:
Aren't these simple devices accurate enough?
Some ppl have good luck with them, I don't trust them. We had one of these before the refractometer -
The readings fluctuated notoriously, and when we finally bought the refractometer, we realized that the water we thought
was at 1.025 was really at 1.029. Ouch.
Aren't you using any mechanical filter in your large tank? (I saw your picture of it.) Does yours rely solely on LR and substrate for its filtering? That would be cool!
No mechanical filtration, unless you include a Protein Skimmer as mechnical filtration. Just LR
(and a refugium). This really isn't unusual - tends to be the "standard" with reef tanks - wet dry's, canister filters, etc., are often recommended for FO
tanks, but are not suggested for reef tanks.
, A/N/N have all tested at 0.00 since tank was set up. This has never varied.
pH = 8.1 (am), to 8.35 (pm)
p04 = 0.00
Salinity = 1.025
Temp = 80.5F - 81.5F (fall/winter/spring), 81F - 83F (summer)
We also have a relatively small bioload, but the tank was set up with *minimal maintenance* in mind. I run the magnet over the glass a couple times a week, and feed the tank daily. Other than that, we do a 20% water change once a month, and clean out the pumps & skimmer at that time, and add kalk
powder to the Nilsen reactor monthly. No other maintenance is done (unless RO
filters need replacing).