"sleddog" wrote in message
. 4.10...
I have a 20 gallon tank with an electric blue johanni melanochromis and
a
jewel cichlid. My setup has been running for about 3 months and my
tests
show the water quality is good. Lately, they both have strange looks on
their faces and are acting somewhat deranged. I know in their natural
environment they dont have the BUZZZ and RATTTTLE of electric pumps,
filters, etc. and am wondering if all the 24 hour a day nonstop noise
has
made them lose their minds.
snip

I suspect that any noise which is constant will be tuned out like white
noise. You can see this by the fish's reaction to a power failure. They
react like the sound of silence is momentarily deafening. Irregular &
intermittent noises would IMO more likely stress them out.

NetMax

Thanks. Sleddog.