Convicts are very aggressive fish. You should just consider using something else to get rid of the algae. I'd suggest something like Aquarium Pharmaceuticals Algaefix which works wonders and has a good price.
Good tank mates for a brown algae eater include peaceful community fish like tetras, guppies, and rasboras. Avoid aggressive or territorial fish that may compete for food or stress out the algae eater.
An algae eating species of any type isn't capable of eating all the algae in the tank. Your going to have to clean the tank yourself. The algae eater will from then on keep the algae levels in your tank down, but not totally.
Nerite snails are a good option for algae control in a guppy tank. They are peaceful and don't harm guppies. Amano shrimp and Otocinclus catfish are also good choices as they eat algae and are generally compatible with guppies.
It depends on what fish you have in the tank!
it doesn't really matter what kind of algae eater you get for the tank.In my experience with goldfish I've found that plecos work well although they get very big and will need to be kept in a very large tank.
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Yes
None, algae indicates a problem that should be resloved.
Lysmata amboinensis (Pacific cleaner shrimp)
It is probably getting into fights with some of the other fish in the tank.
you will need to get an algae eater, they are ugly but they do the trick, also a good quality pump
No it will eat a bit of algae but it certainly won't be capable of cleaning the tank. The amount it eats will depend on how long it takes before the turtle kills/eats the algae eater.