Are your base rocks just setting on the sand? IMO you need to put them on the glass then fill the sand in around them to give some stability. Then you can stack rocks on top of them. If you ever get anything that is a sand sifter it will eventually burrow under the rocks and topple everything. _________ 55 gallon slowly growing reef aquarium, 85 lbs. live rock, 2 1/2" sandbed, 1 False Percula Clown, 1 Sixline Wrasse, 1 Mandarin Goby, Tetratec PF500 filter, 2 110 watt URI Super Actinic VHO actinics, 2 250 watt metal halides with Reef Optix 2 reflectors powered by Blue Wave 3 ballast, born 1/3/08 My Tank Thread My Tank Video  |