Populations of bull sharks are also found in several major rivers, with more than 500 bull sharks thought to be living in the Brisbane River. One was reportedly seen swimming the flooded streets of Brisbane, Queensland, Australia, during the 2010-11 Queensland floods.
exists and is an alternate of . Making the world better, one answer at a time. You could put it through a fine strainer or a piece of mesh so that the sand will fall through and the gravel will stay on top. You could put it through a fine strainer or a piece of mesh so that the sand will fall through and the gravel will stay on top.
For an under gravel filter, this means either vacuuming the gravel when you do water changes or stirring up the gravel to free the debris caught in it so you can remove this debris when you do your water changes. Third, agitate the water in the bowl. This can easily be done with a small water pump or an air pump.