Hanna alk checker

datboichucky · Nov 9, 2019

Anyone else have issues with their Hanna alk checker mine was reading 8.9 did a salifert test and that’s showing a 10.1 for alk

PatW · Nov 9, 2019

Salifert tends to read a bit high. BRS recently had a comparison of the major alk tests and they liked both Salifert and Hanna.

The thing is, the absolute reading is NOT that important. Corals can be raised successfully at an DKH of 8, 9, 10 and so on. Stability of the ALK seems to be more important than the absolute value. An exception is if you run low nutrients with SPS corals in which case you would want to run at a DKH of about 8.

The Aquatic Arsenal · Nov 9, 2019

I was just reading about Hanna Checkers the other day. Someone was suggesting to mark right under the cap on the cuvette so that the light measures in the same spot. The glass can be thinner or thicker in spots.

X-37B · Nov 9, 2019

I always put the 10ml to the front. Easy and repeatable.

datboichucky · Nov 9, 2019

PatW said:
Salifert tends to read a bit high. BRS recently had a comparison of the major alk tests and they liked both Salifert and Hanna.

The thing is, the absolute reading is NOT that important. Corals can be raised successfully at an DKH of 8, 9, 10 and so on. Stability of the ALK seems to be more important than the absolute value. An exception is if you run low nutrients with SPS corals in which case you would want to run at a DKH of about 8.

Nitrates are at 5. I noticed burnt Tips so I was trying to figure out the issue. Alk stays pretty stable 8.9 in the morning 8.9 in the afternoon and 8.9 in the evening this was done on the Hanna.

X-37B · Nov 9, 2019

datboichucky said:
Nitrates are at 5. I noticed burnt Tips so I was trying to figure out the issue. Alk stays pretty stable 8.9 in the morning 8.9 in the afternoon and 8.9 in the evening this was done on the Hanna.

Any pics of the possible burnt tips?