Can some clowns be too aggressive for their nem. I got a RTBA that is 12" and very healthy when put in tank. 1 week after putting it in tank I got it a Gold Striped Maroon Clown. The clown immediatly took to the nem but is so aggressive toward it I fear it will kill the nem. It has ran the nem under the rock it is attached to and has proceeded to clear away all the sand from around the rock. What should I do.