I have a 10g planted tank with Onyx sand as the substrate. I have 5 dwarf puffers and 3 Ottos in this tank. I am supposed to do 50% water changes weekly for the puffers, but am curious how I am supposed to clean some of the nasties out of the sand or if I am to leave it be.
I occasionally feed algae wafers to my Ottos and that sometimes leaves an icky mess behind, which I can usually get with a turkey baster. However, sometimes it's not that easy as some is left behind.
Am I supposed to leave it alone for "mulm" or spot-clean the sand with a siphon like you would a gravel-filled tank? Is there a special siphon you can use for such sandy substrates?