Hi! I think changing the gravel will stress the fish. What I don't
know is what the consequences will be. They may just be a little
stressed until you're finished and will return to normal when you're
done.
Why do you need to change the gravel? How long has the old gravel been
in the tank? There is the problem of destroying the bacteria on the
gravel with the resultant ammonia/nitrite spikes, which could really
stress the fish. Is the tank lightly or heavily stocked? What kind of
filtration is employed? How long has the tank been set up?
Sorry for all the questions, but they are just some of the things I
would consider before changing the gravel
Bob C.
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