My PH is low what do I need to do

[shawnaus17]

My PH is 7.8 right now I did a 10 gallon water change last night. I have a 90 gallon tank with about 12 gallon sump/refugium. How much lime should I put in there?

[migston]

Safest way to raise pH is to increase air circulation. CO2 is what brings down pH so better circulation will blow out the excess. So I'd suggest grabbing a fan of some sort (either a computer fan for a permanent solution or a desk fan for temporary) and having it blow into your sump.

Lime/Kalkwasser will probably help to maintain it but you don't want to use it to drastically raise pH because a sudden increase might kill your critters. I mix my kalk using 2tsp per gallon of RO water and then I drip it into the tank at a rate of about a drop or two per second.