i got a new tank with the filter built into the lid. and part of the filter media has a bag of these hollowed out stone thingys plz what are they and what exactly is there purpose in the filter?
does any1 now what its called?
filter also consists of black plastic balls and then a wooly sponge...
will a albino walking fish eat guppies?
just one thing my guppies have never been in a tank with a heater (for 2 years), and have never had any probs...
