green on glass

This is a picture of a bowl I have at work. It gets regular dosing of fluorish excel, dosing of ferts(including phosphates). 50% weekly water changes to purge and excess ferts as fert dosing is regular. The only light that it gets is from the fluorescent(which I have been told is full spectrum) and filtered sunlight from an adjacent window. The only inhabitant in there is a 9 year old peppered cory cat fish, that is otherwise healthy. As you can see there are significant amounts of algae, some on the older anubias leaves but mostly Green Spot Algae on the Glass. Where the Green Spot Algae is the most prominant is on the side that gets hit with the filtered sunlight. Plant growth is good and I guess you can argue that some snails, shrimp or algae eating fish added would help clean the algae(excluding green spot unless I stick a big nerite zebra snail in there). Keep in mind though that this is only a 2.5 gallon tank, so I don't believe overcrowding the tank is a good idea, given the limited space. And the option of packing it with more plants is not practical. Believe it or not, it is already has packed as it can get without interfering with the Cory's ability to move around. As far as lighting, total light is about 8 hours and the bowl gets covered with a paper bag overnight as the fluorescent lighting is on all night. It also gets a blackout on the weekend. This is insufficient to compensate for the effects of the sunlight in allowing to algae to grow and thrive. Again, just my own observations, make of it whatever you want. Regardless, I will be giving the peppered cory, named George, a bigger home and will be address some of the issues re: more plants, adding shrimp. The new home will be low tech low maintenance and I plan to run the background paper around the new tank to avoid sunlight hitting the tank, just for experimental purposes.