Hey, My mum was clearing out the garage today, and found some old holiday feeding blocks from the days she kept goldifsh (early 00s). Have they "gone off"? They are the hard chalky type, and two packs of them havent been opened so havent been exposed to the damp (they are in cardboard back, plastic front packaging).
Can they be used still? They would be used for my Pearl Gourami.
Thanks in advance