People often ask me the best way to create bommies, so here goes;
+ Get a drill and 10mm masonary drill bit
+ Purchase 10mm diameter perspex rods (clear is better) off ebay
+ start each column with a large flat peice of rock - chisel it or sand it if you need to!
+ place rock on a peice of wood, ensure the drill is at a right angle when drilling the first pilot hole (about 2" into the top of the rock)
+ decide how hight you want the column and cut the rod using a hacksaw
+ insert rod into pilot hole
+ drill the next few peices of rock all the way through and slot onto rod
+ place the whole structure back in the tank
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