I would lean towards the snails making the noise. They do have defenses, which include raises and turning their shell rapidly .. and sometimes taps against the glass when doing it
__________________
28g Nano Cube drilled with 13g sump in stock stand. Vertex IN80 Skimmer, Phosban 150 Reactor, Apex Controller, DIY LED with stock hood, dimmable
Established March 2006
|