found this, hope it helps:
Cause:
Excess silicates & nitrates
Inadequate light
Low oxygen levels
Brown algae 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 & vacuum 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 is easily wiped away. Vacuuming the gravel with a siphon will quickly remove coatings from the substrate. Increasing the lighting will inhibit re-growth of brown algae. As a new tank matures brown algae is often eliminated naturally by plants and green algae competing for nutrients.
Some sucker-mouth 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.
I am concerned though why you paired the multi's with the furcata's. the multi's are more then capable of beating the snot out of the furcata's
