Littlebuck-One or two in a thermos is usually a lot, if they are very big. Sometimes I send a snail shell with a few little ones on it(like 3 or 4). The space is limited. You don't want to send more than one piece of rock rubble at a time unless you can rubber band them together. I have convinced myself that 2 different rocks inside that thermos act like a "grinder" on the coral!! :scared: Free floater are ok in pairs.
Style-There are different ways to do this. My favorite is to use some netting (like your fish net) and wrap it around the shroom (snug but not too tight) and the rock you want it on. It works well to make a "bag" of the net and rubber band the whole rock/shroom combo in there.
Next, put it in a place of low flow but medium light(the net blocks a lot of light) and wait a few days to see if it attatched. Some attatch in a day or 2-some take a week. :joy: