Thanks guys and west1 i used to have all white sand(see old pics) but it got low due to siphoning and i wanted a change so i got some black/grey stuff and mixed it in and ive put more in on some of the pics,you can probably tell which ones.
Oh, im thinking about buying 2 bags of Tan colorquartz and 1 bag on black.... mix them together to make my sand 2toned with a stronger color for the Tankmates
Thanks West1,i say go for it,my fish sort of mix it for me but i think eventually it will all be the dark as the white is alot finer and gets siphoned alot easier.