everybody covers the back wall with black paper or something like that. has anybody covered the side walls? my back wall is covered with black paper and also everything can grow on it like coraline algae even corals like montiporas and others etc.... all i do is leave it alone and maybe glue a coral to it once in a while and let it take off. what's the difference with the side wall? if i leave it alone, algae grows on it and unwanted stuff like hydroids. if i glue a coral to it, most times it doesn't make it. is it because it's not covered like the back wall and light transmits through it? will I get the same effect if I covered the side walls like I did the back wall when I started the aquarium?