I'm looking for lightweight stones for a tank of rockdwellers- african cichlids. Any good mail order sources for lava stone (if you boil + submerge it, it sinks!) or other light weight stone? Non-natural materials also ok.
Beside the rock I'll use 6" lenths of PVC pipe partly covered with the crushed coral substrate.
Beside the rock I'll use 6" lenths of PVC pipe partly covered with the crushed coral substrate.