what are you calling cleaner clams?? I have little neck clams in my fuge on my fowlr
and Im not 100% sure if there helping or if its the macro or xenia but my nO3
is lower then before adding them.
I picked up 6 at the super market let them sit in some tank water for a few hours to make sure they were all alive and then I tossed them in.
They bury themselves so IMO
I dont think the puffer would get them unless he saw the foot sticking out of the SB. Large puffers will crush the shell but IMO
the small ones won't