alright so my grandma has had an african chichlid since it was a little egg, electric yellow with black stripes. she got it from my aunt who worked in a pet store. and it has been in a 3.5 gallon tank its 5" long... so we went out and got a 30 gal and let it cycle made everything perfect. two months in the tank it still acted scared and stayed in the corner scared of every movement anything that made noise ect.... so we put it back into the 3.5 gal and its happier than ever moving around and such, so i took the aquarium back and now were gonna try a 10 gallon. but im confused as to why this fish liked the small tank and not the big tank full of hiding places and plants? sorry im a salty so i dont know much about fresh water... if anyone could help thatd be great.