Raising pH

I don't believe baking soda is your answer. It only raises your alkalinity, which you should probably check at this point. If you have a high alk then your pH will be more stable and less likely to change. Have yougot a 2nd set of testing done yet? It might be time to buy a different test kit our have your LFS check for you. Just a thought.

Have you tested your alkalinity and calcium?

The baking soda will push the alkalinity up to support higher calcium levels, and ideally is used as one half of a two part mixture, the other part would be a lime base for calcium, either pickling lime, kalkwasser, or Dowflake will work safely. They will definately give you a raise in PH, but again I can't stress enough about not adding anything that you can't test for.

Okay, Just finished running the battery of tests.
SG 1.024
Ammonia 0.25 ppm API test kit
Nitrate 0 ppm API test kit
Nitrite 0 ppm API test kit
pH 7.8 API test kit
pH 8.05 Seachem test kit
Calcium 200-250 Seachem test kit
Iodine 0 Seachem test kit
Alk 9 meq/L Seachem test kit

pH and Calcium are low, Alk is high.
What would be the recomendation to start setting it right?

Robert

Start to slowly raise the calcium levels up, this will also cause a rise in the pH. Easiest way would be to top off with limewater.

How are you topping off your tank now? If you are using some sort of auto topoff or just a drip, adding any of the mentioned sources of lime to the top off water will do the trick. This is how most replace the calcium that is consumed by coral and other critters. Your target range should be around 300-350ppm calcium, and Alkalinity around 11dKH. Slow and steady is the key.

Currently use tapwater treated with conditioner, to top off the tank. The tapwater here has a pH of 10.2. Will dissolving a tablespoon full of Lime in each cup of freash water used for top off work for raising the Calcium levels?

Robert

too much, about a tsp per gallon of pickling lime will do you. Actually that's nearing the saturation point.