what cal, mag supplements do you use?

you need to be careful with any Mag supplement, especially the liquid stuff, the liquid Mag supplements are loaded with ammonia IMO, try to do a bit more research and see what comes up.

 

Really? I've never heard of this before?

 

That's what I've always been told, just about every LFS employee that I have trusted said that, here, this is taken off of marine depot -

Description Main Features

SeaChem Reef Advantage Magnesium ™ is a concentrated (80,000 ppm) optimized blend of magnesium, chloride, and sulfate salts designed to restore depleted levels of magnesium with minimal impact to the ionic ratios found in natural sea water. Reef Advantage Magnesium™ contains no ammonia! This is a common contaminant in every liquid magnesium supplement on the market. Severely depleted levels of magnesium (below 800 mg/L) can cause depressed pH levels and an inability to maintain proper calcium levels. Magnesium depletion is commonly associated with the use of kalkwasser. 300 g treats 5,000 L (1,300 gallons).

 

Well, I would take a reputable aquarists word for it but I don't believe everything I read on a label I've never used liquid magnesium supplements but it's definitely something I'll keep in mind if I ever need to!!

 

same here!