supplementing the tank with?
We do no supplementing save Kalkwasser once a month or so, having just switched to an aragonite substrate we have cut down on the Kalk dosing. Alex Landman >> Hmm… glad to hear of the alkalinity, calcium supplementation move… and do think the sponge may have needed “something” it wasn’t getting… folks who keep these simple life forms for any length of time do work into a feeding regimen (a couple of times a week, washing the system with phytoplankton mainly… while turning off the mechanical filtration for fifteen, twenty minutes… best on a timer). It is just as likely however, that a chemical interaction would account for your observations… Or even an infectious disease that went from chronic to acute in some change, weakening of the sponge… You might have some luck in trimming off the whitened, dying ends… and trying feedings.
