I am wanting to add about 20lbs of LR. Currently have a combination of Figi and Kelani. I am looking at Caribbean Rock from eTropical (Foster and Smith). Their price shipped is quite reasonable comes to about $4.50 per pound. So anybody have any experience with this type of rock and will it mix well with the other rock????? :? By the way I have about 40-45 pounds of Lr in a 55 gallon already.