BabyB - Actually, I used to put the zoos in the sand so they won't spread onto the rocks (they can get out of control). However, 2 weeks ago while boiling some zoos off some of my rocks I inhaled the palytoxin and spent a week in the hospital. Needless to say all my zoos are now gone!!
jfreeze - I used the 1/2" locline. You'll have to sand down the current biocube fitting a little to get the locline to snap on to it but it works well. Good luck.