Mg Plus Magnesium Supplement - 250ml
Mg Plus Magnesium Supplement - 250ml is backordered and will ship as soon as it is back in stock.
Mg Plus Magnesium Supplement - 250ml is backordered and will ship as soon as it is back in stock.
Concentrated liquid magnesium to help increase your tanks Mg level without increasing any other elements concentration.
Magnesium is an essential part of coral development and water chemistry. Magnesium has multiple roles in the reef tank, most notably its ability to let calcium and alkalinity become supersaturated and keeping them steady and balanced. MG Plus is perfect for smaller tanks that do not require much magnesium or larger tanks that require big swings without changing any other parameters.
Mg Plus can be used with:
- SPS corals
- LPS Corals
- Soft Corals
- Clams
Instructions:
2 tsp of solution increases the magnesium level in 27 gallons of water by 5 ppm.
It is suggested to start with a dose of 5mL per 27 gallons of aquarium water daily. After each dose, test your aquarium's magnesium level and adjust dosage as necessary for your systems requirements.
Contains: Magnesium, Chloride, Sulfate
Shipping (Livestock)
- Ships via UPS Next Day Air (Continental U.S. only)
- We ship Monday–Thursday (you’ll choose your ship date at checkout)
- Most deliveries arrive before noon, but rural areas may be as late as 7:00 PM
- Orders ship only to the checkout address unless arranged by email
- Local pickup available in Chicago Ridge, IL — email us to schedule
Live Shipping Rates
- $35.99 flat rate (most states)
- $25.99 flat rate for IL / WI / IN
- FREE shipping on website orders over $279 in livestock
- Livestock total includes corals + inverts only (discounts, store credit, and dry goods don’t count)
Dry Goods Shipping
- Non drop-ship dry goods ship for $9.99 or FREE over $79
- Items marked “Ships Free With Corals” ship free when included with a livestock order
DOA (Dead on Arrival) Policy
- We guarantee livestock will arrive alive and as described
- If something arrives DOA, email sales@coralstop.com within 3 hours of delivery (based on UPS posted time)
- Please include clear photos of the item in the bag and out of the bag
- You must be present to receive delivery — missed deliveries void DOA coverage
- Verified DOAs receive replacement or store credit (shipping is not credited)
- UPS Next Day Air delivery times are not guaranteed (weather/mechanical delays can happen), but we’ll work with you to help make it right
Need Help?
- Email us anytime: sales@coralstop.com
- Policies may change without notice at the discretion of Coral Stop LLC
How We Photograph Our Corals
- Every WYSIWYG photo is taken in our systems with consistent lighting and a custom white balance.
- Our goal is simple: show the coral as it looks in a properly lit reef — not overly edited or exaggerated.
Our Camera + Lens
- Camera: Sony a7 IV R (mirrorless)
- Lens: Sony FE 90mm f/2.8 Macro G OSS
- Macro glass lets us capture fine details like texture, polyp extension, and subtle color shifts without getting too close.
Lighting We Shoot Under
- Primary: EcoTech Radion XR30 Blue
- Supplement: ReefBrite XHO
- Our Radion “photo” mix:
100% Violet
100% UV
100% Deep Blue
65% Blue
Color Accuracy
- We use a custom white balance so the photo matches what you’ll see under a clean, blue-leaning reef spectrum.
- Corals can look different tank-to-tank based on nutrients, spectrum, and flow — but we aim for honest, repeatable photos you can trust.
Alive Arrival Guarantee
UPS Next Day Air
Cultured & Sustainably Sourced Coral
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