Hi, One of the first things I do when I get a new Tank is to strip everything out of the hull and glue a sheet of "VELCRO" to the floor,
Then I glue a strip of "VELCRO to the base of whatever I will be returning to the hull,
I keep speakers in place with "SCOTCHTAPE" blocks and do remember that if you are planning on using a "CLARK" board it will fit exactly into the RX18 case so if you glue a strip of "VELCRO" to its base access to the "CLARK" board is much easier. shaun