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Reef aquarium comparisons
The reef hobby is full of false dichotomies that vendors love and hobbyists fight about. These pages compare the actual specs side-by-side and tell you which choice fits which situation — sourced, not opinionated.
Salt mixes
Dosing & supplements
Randy Recipe #1 vs BRS Two-Part
Randy Holmes-Farley's Recipe #1 (baked baking soda + CaCl₂) vs BRS's two-part (soda ash + CaCl₂) compared on cost, pH side effects, mixing complexity, and dose ratios. Both are stoichiometrically balanced — but they're not interchangeable.
Calcium reactor vs Two-part dosing
Calcium reactors vs two-part dosing compared on uptake range, monthly cost, complexity, and what happens when things go wrong. Pick by consumption rate, not by hobby trend.
Kalkwasser (lime water) vs Two-part / Calcium reactor
The three main calcium and alkalinity supply methods compared. Kalkwasser drips with top-off, two-part doses via pump, calcium reactor dissolves aragonite media. Each has a sweet spot.
Tanks & hardware
Substrate
Filtration & nutrient export
Lighting
Apogee MQ-510 vs Seneye Reef
Apogee MQ-510 vs Seneye Reef compared as PAR measurement tools. Underwater correction factors, accuracy, cost, and what each device actually measures — because they don't measure the same thing.
T5 HO fluorescent vs LED
T5 high-output fluorescent vs LED reef lighting compared on PAR, spectrum, electricity cost, lifespan, and coral coloration. The right answer in 2026 is usually 'hybrid' — here's why.
Testing
Last reviewed