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What options to lower Ph? Consistently Ph 8.7-8.9 in reef tank. Thanks

I add kalkwasser by dosing pump during the overnight hours. I also have a calcium generator running continously. My Ph stays between 8.58 to 8.9. any suggestions to gradually lower the Ph. Corals/inverts/fish all doing well. Thanks.

I use the SeaChem Iodine test kit to monitor my levels. I do run controls with each test sample. I only use activated charcoal on a bypass in my sump 12 hours weekly before additives to the tank. My volume consisting of the reef tank, refugium, and sump is aproximately 300 gallons. I have been...

My reef tank has a squamosa approximately 9-10" in length. It is thriving and growing. My tank parameters are great and everthing from soft to hard corals are doing well. All other inverts are excellent. My issue is that every time I introduce a derasa into the tank, within 24 hours it is...

Anyone recommend a check valve that is dependable to function correctly? Thanks!

What is the ideal Kelvin lighting for growing phyto culture

First: My reef tank is having difficulty with maintaining adequate alkalinity. My Ph: range 8.2-8.3, Calcium 480. No phosphate/nitrate. Iodine/Strontium/Magnesium/Spgr/Temp and all else normal. 200 gal tank/70 gal sump. All corals/inverts/fish doing well. Total Alk 3 (6kh). Need I worry or what...