Cyano usually means imbalance + dead spots

Cyanobacteria often shows up as red/burgundy slime on sand and rock. It’s common in newer reefs and in tanks with low flow areas, excess nutrients, or inconsistent maintenance.

Common triggers

• Dead spots with low flow
• Detritus buildup
• Nutrient swings (yo-yo feeding/export)
• Old/dirty mechanical filtration

Safe, stability-first steps

• Increase flow over affected areas
• Siphon cyano during water changes
• Clean mechanical media more often
• Test nitrate/phosphate weekly and adjust slowly

Flow + filtration support

Cyano hates strong, consistent movement and clean export routines.

Browse: Aquarium Filters, Pumps & Media.

Support products

Conditioners and bacterial products can help stabilize after cleanups and reduce “mini-cycle” risk.

Browse: Aquarium Chems, Bacters & Cultures.

CTA

Want cyano gone for good? Fix flow, export, and consistency first: Shop Reef Tank Supplies.