I currently have about 6# of live rock and about another 3# of ruble rock in a 10 gallon,I want to order 30# of rock from reefcleaners.org and add that rock and the rock that I have to a 40 gallon breeder tank .From what I have read u can request the size rocks u would like in the comments section when ordering the rock ,what size or shapes would be good for a 40 breeder.