This facilitates a convenient form of feeding the coral as all that is required is to place frozen food at the inlet of the pump. By approx the end of the first month the high light areas of the limestone surface were covered by a brown algae, perhaps a diatom growth. There was approx. Brown algae is now populating lower light areas with a light covering. There is currently no algae whatsoever inhabiting this cave.
Today there is only slight growth of the various coralline algae as was on the third month.
Due to the fact that the limestone is carved and not assembled, as the live rock requires, it is possible to create solid caves. These lend themselves perfectly to use, as I have with Tubastrea or other night loving corals, as it also creates defined flow paths for water and can be easily carved and drilled for ease of plumbing and pump placement. As they lend themselves to ease of constructing vertical walls with large overhangs that are technically impossible with live rock except when using various fastening methods such as fishing line and cable ties. For this reason limestone can be used to create vertical walls that complement a live rock structure and to add an extra feeling of depth to a tank. As base structure of the main reef with the addition of live rock placed over the limestone.