I just found this and it sounds like the algae I have:
Other Names: Gravel algae, Silica algae
Color: Brown
Appearance: Begins as brown patches on the gravel and/or glass, then rapidly coats most surfaces of the aquarium with a thin, dark brown coating that is easily removed. Unlike blue-green/slime algae, it does not come off in large slimy sheets
Cause
° Diatoms
° Excess silicates & nitrates
° Inadequate light
° Low oxygen levels
Brown algae is due to diatoms, and is a common occurrence in a newly set up aquarium. It is generally caused by too little light, an excess of silicates, an abundance of nutrients, and too little oxygen. Silicates can build up through tap water that is high in silicic acid, and silicates that leech from some types of substrates.
Cure
° Wipe off surfaces & vaccine gravel well
° Use silicate adsorbing resin in the filter
° Increase the lighting
° Stock a plecostomus or several otocinclus
This type of algae does not adhere strongly to the tank surfaces, and may easily be wiped away. Vacuuming the gravel with a siphon will quickly remove coatings from the substrate. Increasing the lighting will inhibit regrowth of brown algae. As a new tank matures brown algae is often eliminated naturally by plants and green algae competing for nutrients.
Some suckermouth catfish will readily eat brown algae, most notably plecostomus and otocinclus. If the problem is due to high silicates in the water, and the brown algae persists, a special silicate absorbing resin can be used in the filter.
Prevention
° Use of RO water
° Regular water changes
° Regular aquarium cleaning
° Good lighting
As with any algae, keeping the tank clean and performing regular water changes is one of the best preventative measures. Unfortunately it is still possible to get algae in spite of regular maintenance, especially in a newly established aquarium. Prompt attention to sudden algae growth will prevent more serious problems.
