Adding Sand to Substrate

In My 75 gallon I have about 50-60 lbs of crushed coral.

I was thinking of adding sand, and kind of mixing it in, but didn't know if this would make it too difficult to clean or not. I also was wondering if I would have a problem doing this with the fish in the tank.

(catching 20 3-4" cichlids is a pain!)

Thanks for your help -B

What do you do, lower in a few cups of rinsed sand at a time, and just mix it in...? will really cloudy water affect the fish, and the oxygen in the water?

I just don't want to lose a tank full of fish I can't replace, just trying to pretty up the look of the substrate...

Also, I know gravel vaccing sand is different.. .So how do you do it if it is a mix of crushed coral and sand?