Originally Posted by
crabbysd
there is not enough food in the tank for the snails. Assuming your rodi is good, that's about all it could be.
Cyano, ditoms, brown slime algaes on the glass are normal in a new tank and itll phase out eventually. the most common cause of them in a new tank is No3, as its part of the constant cycle. po4 rarely unless its old rock. Cyano likes both no3 and co2. Cyano can use the new aragonite (as it buffers more when new and is also dissolving slightly in the new PH) as a carbon source. Brown could also be ditoms. the arganite dissolves and softer minerals are released. Silicate being one of them