Comparison
Red Sea Coral Pro vs Tropic Marin Pro Reef
Side-by-side spec comparison of Red Sea Coral Pro and Tropic Marin Pro Reef salt mixes. Real manufacturer numbers for alkalinity, calcium, magnesium, pH, and mixing ratio — plus when to actually use each.
The contenders
Side A
Red Sea Coral Pro
Premium reef formula
Side B
Tropic Marin Pro Reef
Low-alk reef formula
Spec-by-spec
| Spec | Red Sea Coral Pro | Tropic Marin Pro Reef |
|---|---|---|
Alkalinity (mixed @ 35 ppt) source | 11.5–12.5 dKH | 7–8 dKH |
Calcium source | 450–480 mg/L | 430–450 ppm |
Magnesium source | 1,350–1,430 mg/L | 1,300–1,350 ppm |
Potassium source | 385–415 mg/L | Natural seawater ratio |
Target pH source | 8.2–8.5 | 8.0–8.4 |
Mixing ratio (per US gal) source | ~145 g (5.1 oz) | ~150 g (5.3 oz / 0.5 cup) |
Max mix time source | ≤4 hours (Red Sea spec) | Stable indefinitely |
Cost per gal mixed source | ~$0.49 (2021 BRS data) | ~$0.55–0.65 (variable retailer) |
- Max mix time: Coral Pro precipitates if held too long.
Which one for which situation
SPS-dominant tank, no dosing, weekly water changes
Pick: Red Sea Coral Pro
The high alkalinity and calcium on Coral Pro replenishes faster-consuming SPS tanks without supplements.
Mixed reef with calcium reactor or two-part dosing
Pick: Tropic Marin Pro Reef
Pro Reef's 7–8 dKH target won't fight your dosing. Topping a reactor-driven tank with high-alk salt causes drift.
Fish-only-with-live-rock (FOWLR)
Pick: Either works
Neither salt is wasted on FOWLR. Pick on price and availability.
Frag tank or coral grow-out
Pick: Red Sea Coral Pro
Coral Pro at 11.5–12.5 dKH directly drives skeletal deposition. Confirmed by Red Sea's own SPS guidance.
ULNS / SPS at low-nutrient parameters
Pick: Tropic Marin Pro Reef
Pro Reef pairs cleanly with controlled dosing regimes (e.g., Triton Method) where you want predictable, low baseline alk.
Which one should you buy?
reefcalcs pick
Red Sea Coral Pro Salt — 22 kg bucket (175 gal mix)
If you do weekly water changes and don't dose, Coral Pro's 11.5–12.5 dKH replenishes an SPS tank on its own. The 22 kg bucket is the cheapest way to buy it per gallon mixed.
~$90 · Where to buy →If you dose or run a reactor
Tropic Marin Pro Reef Salt — 25 kg (200 gal)
Pro Reef mixes at natural-seawater 7–8 dKH, so it won't fight your dosing schedule. Topping a reactor-driven tank with high-alk salt is how you get slow upward drift.
~$110 · Where to buy →If you're still cycling
Instant Ocean Reef Crystals — 200 gal box
No reason to burn premium salt on an empty tank. Reef Crystals mixes to usable Ca/alk/Mg for roughly half the cost while you wait out the cycle.
~$55 · Where to buy →Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.
Also mentioned above
Affiliate links. As an Amazon Associate, reefcalcs earns from qualifying purchases.
Related calculators & references
Sources & references
- 01Red Sea — Coral Pro Salt manual (PDF)https://redseafish.com/wp-content/uploads/2013/12/Coral-Pro-Salt__Multilanguage-Manual_GB_FR_DE_IT_ES_PT_JP_CH_v17a.pdf
- 02Red Sea — Coral Pro product pagehttps://g1.redseafish.com/red-sea-salts/coral-pro-salt/
- 03Tropic Marin USA — Pro Reef FAQhttp://www.tropicmarin-usa.com/faqs.html
- 04Tropic Marin — Pro Reef product infohttps://www.tropic-marin-smartinfo.com/pro-reef?lang=en
- 05Bulk Reef Supply — Coral Pro spotlighthttps://www.bulkreefsupply.com/content/post/brstv-product-spotlight-red-sea-coral-pro-salt-mix
Last reviewed