well, actually i dont set up the lighting cuz that is unnecessary,
when i took the picture,lighting from camera was reflected,that made my pictures suck
so i just put my table light above the tank then i found this amazing effect.
furthermore,i bought the tank on fish street last year and that is second hand and i find this is very special the backside made of black glass. so that make the environment in the tank become more misery hahah