Black background I'll give a go - black gravel I'll leave though, i already have black sand and it wasn't cheap!!
Re the tetratec ex1200- how noisy are these things? I could always put it next to the cabinet as there is space between the tank and wall which isn't visible, I just wouldnt want it being too noisy!
Re the tetratec ex1200- how noisy are these things? I could always put it next to the cabinet as there is space between the tank and wall which isn't visible, I just wouldnt want it being too noisy!