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you may find one of these very useful and not just for the fish tank. www.maplin.co.uk/Module.aspx?ModuleNo=38343&TabID=1&source=1&doy=13m3

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?