Can also grow quite large and may become aggressive. Individual species may be difficult to identify, although the general care is the same. Many attractive species available. Some are expensive. Not all species eat algae.
Some species are efficient algae eaters for medium sized tanks.
Some are expensive. Require good water quality. Brown Algae - Diatoms Diatoms are single celled algae, brownish in color. It starts out as a dusting on the substrate that rapidly turns into a mat that can cover the tank over in just 5 days, provided that they have a surplus on nutrients available. Eliminating silicates can control diatoms.