How long do Blue Tangs live?
In a well-run marine tank, Blue Tangs live 8-20+ years. Their lifespan hinges on tank size, stable salinity, and a good diet; stress and disease cut it dramatically.
What do Blue Tangs eat?
They are primarily herbivorous: marine algae, nori, and spirulina-based foods, plus some meaty foods. The mistake is a low-algae diet, which leads to wasting and head-and-lateral-line erosion; feed greens daily.
Tank size and water parameters
Adults need a 75-gallon (285 L) or larger tank, preferably longer. Target 75-82°F (24-28°C), pH 8.1-8.4, specific gravity 1.020-1.025, ammonia/nitrite zero, nitrate under ~20 ppm. Strong filtration, live rock and open swimming space are essential.
Common mistakes with Blue Tangs
Deadliest errors: a tank far too small for a 12-inch swimmer; poor marine water quality triggering ich; a diet low in algae causing HLLE; and buying wild-caught instead of tank-raised stock.
Beginner mistakes to avoid
- Too small a tank — adults need 75+ gallons of swimming room.
- Low-algae diet — causes wasting and head-and-lateral-line erosion.
- Poor marine water quality — ich and stress follow quickly.
- Wild-caught over tank-raised — choose sustainable, hardened stock.