brown spots inside tank.

I have noticed brown spots appearin on the ornaments and fake plants in my tank which is only 6 weeks old. I will be gettin a water test done thursday morn but if anyone could help before then id be greatful

Howya this is taken from an external site.

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. Prompt attention to sudden algae growth will prevent more serious problems.

John