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Just my 2 cents.
In my tank when my ph reaches the point where I begin to get concerned (7.9) I add kalk or alkalinity buffer. I think the gradual lowering of ph indicated the consumption of Ca and Alk (carbonate hardness). In other words your buffering capacity is deminishing and its time to suppliment.
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THE BARQUARIUM:
55 gallon cube - 50 lbs LR - ASM G3 skimmer - 30 Gallon sump - 22 Gallon refugium / frag tank - 4x 24 watt HO T5's - Mag 9.5 return - Pin Point PH monitor - 400 watt XM 20K MH in Lumenarc reflector - Dual stage GFO/NO3 media reactor - 6 stage RODI auto top up -Wavemaster Pro running 3 Koralia 2's.
Fully stocked with fish, corals and usually some fine scotch
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