For me, both high (>10) and low alk (<7) can be problematic. Low alk especially.
I also have noticed times when it seemed dosing "balanced" amounts of alk and ca wasn't yielding reasonable numbers. I used to have this 24" back to front of tank Idaho Grape Monti cap. that was a ginormous calcium sponge.
And adjusting dosing to accommodate ever changing populations and growth of stony corals can provide additional challenge.
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The human desires for instant gratification and immediate problem resolution cannot be satisfied with this hobby.
Former president and co-president of the Wine Country Reefers.
Current Tank Info: 60 gallons of Scleractinia and Zoanthidae lit w/ LEDs
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