I have always been under the impression that along with the correct lighting u needed excellent water quality for corraline to grow in ones thank. However it seems of late that corraline is growing majorly in my 10 gallon. Its on the pipes, rocks, empty snail shells and glass. And i will be the first to admit that my quality of water is not the best in this tank. Have i been wrong about corraline needing good quality water to grow?