You are going to have a battle royale very soon in your tank!!!
Any more than one pair of clowns in most any tank is asking for trouble....especially when one of them is a maroon. They are among the most agressive fish out there. Especially when they mature, the large females are ferocious!!!
Also, having 3 different anemones is no guarantee that the clowns will each host in one of them. Besides the above problems, some clowns will host in multiple anemones if available and some will never host (tank raised perculas notorious for this)
Next, having more than one type of anemone in a tank could be trouble. they tend to move around and if they encounter another one of a different type, it will be chemical warfare.
What type of lighting do you have? Should be it least 400 watts total if you are even thinking of anemones.
Not to flame you, but you are asking for it with that many clowns and that many anemones. Get rid of two of the pairs, make sure you got the right lighting, and then get one anemone.