June 12, 2026 Update
Test results:
● 1 week since implementing AWC
● Dosing 3.0 ml/day AFR starting 5/16/2026.
● Tests are post-today's AFR dosing.
● Phosphate, nitrate tested before a.m. feeding.
○ Ca: 440 ppm (-10/14d)
(target: 400-450 ppm)
per Salifert titration
○ Alk: 6.7 dKH (-0.3/14d)
(target: 8-12 dkH)
per Salifert titration
○ Mg: 1,260 ppm (-75/14d)
(target: 1,250-1,400 ppm)
per Salifert titration
* Increase to 4.0 ml/d AFR.
* Added 1.0ml AFR now.
○ pH: (pre-dawn) 7.9
(mid-day) 8.0
(target: 8.1-8.4)
per API colorimetric
○ Salinity: 1.0266 SpG/ 35.9 ppt
(1.0261 SpG/ 35.0 ppt
post-adjustment)
(target: 35 ppt)
per TropicMarin hydrometer
* Watch this. Hypothesis: Daily AWC x solid tank lid means ATO rarely kicks in. Effectively, AWC doubles as ATO, but using salt water to replenish, causing salinity creep. This is somewhat offset by AWC water replacement, but not completely.
○ Temperature: 79.6°F
(78.4°F post-adjustment, related to open-lid tank time and room temp RO/DI (1/2 gal) and salt mix (1/2 gal) substituted for 1 gal canister filter water to adjust salinity)
(target: 73-84°F)
per Weber digital therm.
○ Ammonia: ppm (not tested)
(target: 0 ppm)
per API colorimetric
○ Nitrite: ppm (not tested)
(target: 0 ppm)
per API colorimetric
○ Nitrate: 53.7 ppm (+7.4/14d)
(target: 5-50 ppm*)
per Hanna HR Checker
○ Phosphate: 0.57 ppm (+0.13/14d)
(target: 0.06-0.3 ppm*)
per Hanna ULR Checker
*
https://www.reef2reef.com/ams/randy’s-thoughts-on-nutrient-target-ranges.1087/
* Add 2.5 tbsp RowaPhos in bag in canister filter.
(Recommended = 4 tbsp in reactor, (x2 if in bag) to go from 0.57 to 0.20; using 2/3 reactor recommendation in bag)
* Replace Rox 0.8 GAC, 2 tbsp (3 is recommended by
BRS) Replace in 2 weeks.
* Blow off rocks
* Rake sand
* Treat with coral snow + Microbacter7
* Clean canister filter
* Replace 1/2 gallon tank water with RO/DI to correct salinity
Last (5/29/26):
● Dosing 3.0 ml/day AFR starting 5/16/2026.
● Tests are post-today's AFR dosing.
● Phosphate tested before a.m. feeding.
○ Ca: 450 ppm (-10/14d)
(target: 400-450 ppm)
per Salifert titration
○ Alk: 7.0 dKH (-0.9/10d)
(target: 8-12 dkH)
per Salifert titration
○ Mg: 1,335 ppm (+15/14d)
(target: 1,250-1,400 ppm)
per Salifert titration
* Stay with 3.0 ml/d AFR.
* Add 34 ml RHF R1P2 Alk
○ pH: 8.3 (after Alk added)
(target: 8.1-8.4)
per API colorimetric
○ Salinity: 1.0265 SpG/35.7 ppt
(target: 35 ppt)
per TropicMarin hydrometer
* Top off
○ Temperature: 79.4°F
(target: 73-84°F)
per Weber digital therm.
○ Ammonia: ppm (not tested)
(target: 0 ppm)
per API colorimetric
○ Nitrite: ppm (not tested)
(target: 0 ppm)
per API colorimetric
○ Nitrate: 46.3 ppm (+7.6/14d)
(target: 5-50 ppm*)
per Hanna HR Checker
○ Phosphate: 0.44 ppm (+0.05/10d)
(target: 0.06-0.3 ppm*)
per Hanna ULR Checker