wow, ten gallons, it's hard to find balance in an aquariums so small because minute changes have large impacts. Plus that is a heck of a lot of light for such a small tank. I'd half it.
The diatoms (brown algae, assuming that's what the brown stuff is) could be due to an imbalance in the tank (as also suggested by the algae problem). These go away on their own when the tank stabilizes. They are more common in new tanks. Harmless, albeit unsightly.
just wondering what your water change routine is? how much/how often? if plants don't have enough CO2 from your fish then algae could also have an edge. water changing and supplying a co2 rich water supply may help. or you could add a carbon (?) supplement like Flourish Excel. Because your plants are growing well I'd almost recommend using half the Excel dosage if you decide to go that route. All this assuming CO2 shortage is part of the problem. If an insufficient supply of CO2 is available for the plants, it will limit them to that degree and leave all of the extra light and nutrients for the algae to thrive from.
Anyway, forget about all that for now...I bet if you limit your light to 1-2 wpg everything will balance itself out. Be patient, give it a couple of weeks to show improvements.
as far as getting algae eaters, can't think of much that is well suited for a ten gallon, aside from shrimp (amanos work wonders on both of my tanks). plus you want to find the imbalance and correct it rather than treating the symptom only.