I use Seachem Magnesium crystals, you can get them at your LFS or JLAquatics... Crystals are much cheaper than the liquids.
Usually Strontium and Magnesium levels are consistant with each other, if you need Magnesium then you should add Strontium. For this reason I only test for Magnesium levels, but if they are low, I also dose accordingly for Strontium based on this fact
Again, Strontium in crystal form is very cheap.
I hope this helps
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Setup: 180G DT, 105G Refuge (approx. 300lbs LR, 150lbs Aragonite)
Hardware: Super Reef Octopus SSS-3000, Tunze ATO, Mag 18 return, 2x MP40W, 2X Koralia 4's Wavemaker
Lighting: 5ft Hamilton Belize Sun (2x250W MH, 2X80W T5HO)
Type of Aquarium: mixed reef (SPS & LPS) with fish
Dosing: Mg, Ca, Alk
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