lol, i cant help that algea. I cant keep a pleco in there, and the tank faces a window, so in comes the sun, an dthne the algea grows. I dont want to use chemicals though. I do use a algea pad. If you have any suggestions on a small algea eater, let me know!
As some one else has mentioned ottos are great !! i put 6 in my 112L tank and they cleaned it a treat within a few days,
one thing that may help but is also down to circumstances too.....
My 165L is in my bedroom which faces the sun from 11am all the way through the day and till it gets dark, i used to have such a problem with algea id clean it off the glass and within 2 days it would be back and messy as ever (as in cant see into the tank), the sand was no longer sand but again covered in green algea like a carpet.
the tank has always had plants in it (aprox 8) the plants are great growers and need trimmed ever week, i cant remember the names of the plants tho, also one coconut cave with java moss on it, 2 moss balls and 8x ottos, and yet the tank still covered in algea within 2 / 3 days but now not a problem !!!!
What i did..... Close the curtains lol, i have now got my curtains closed 24/7, yeah it does make my room darker but hey if i need more light i can turn my light on, and it is helping me and the fish, now with the curtains closed it doesnt get so hot in my room (in summer and last few sunny days us brits have had recently) my room temp has been close to 38c (100 F) when i left the curtain open by accident.
so now i have a cool room the fish tank doesnt get so warm too and no more algea !!! all because i closed my curtains. again it does depend on circumsances as if your tank is in the front room / living area for the family they may not want the curtains closed all the time but it has worked for me and my fish, and if possible may work for you tool
hope this is a little help to you.
Scott