The quietest air pump i have seen was in the lab at school.
The pump had a vertically mounted magnetic disk (about the size of a cd) part of which was located in a transformer.
One side of the disk had a pin attached to it. Connected to the pin were 2 horizontally opposed pistons (Think...
Thanks for the quick reply.
The parents usually defend the eggs / fry for about 7 -8 days, before they are all eaten.
No other fish have been killed yet, but if the aggression gets to bad i will remove the eggs / fry as you suggested.
thanks for the help.
hi, my angel fish are laying eggs every 3 to 4 weeks in a community tank.
They have just spawned again today and with each spawn they seem to be getting more aggressive to the other fish.
Is laying eggs every 3 - 4 weeks the norm for angel fish and how bad is the aggression likely to get?