elisew
I don`t count sheep to get to sleep, I count fish
I wouldn't go with the marine blue bulb. I think one where the white and blue are combined is the most you need. What color is the white bulb you got? It should say something like 10,000K.
I agree, the blue bulb won`t give you crisp, clear viewing and colour of the fish anywhere near as well as a white one (or 2) will give you
If you`re determined to go with the ocean rock, do keep an eye out that the fish don`t get stuck in the holes as they get bigger
A little tip......get yourself a thermometer for the inside of the tank and keep an eye that the water temp doesn`t go much above 24-25*C max for Malawis (22-23 is recommended I believe)