How 2 Create Green Algae Indoor....? Options

[fish_dream88]

i hav a 3ft tank which nw inside hav 10 small ranchus....and outside d tank i am using 4 plant tube lights and a Eheim filter 2224....

i hav on d lights 10 hrs a day and i hav nt clean d tank 4 a week aready....but d tank did nt start 2 grow green algae on d wall of d tank..instead it start 2 grow brown algae.....y is it lik tat....???


thanks 4 ur answer....!!!