For a 600l tank I'd use two 500l filters independently.


"SkyCatcher" wrote in message
...
Hi,

I hope I'm not being dim but if I have a 600 litre tank can I use 2 x 300
litre rated external filters on it? If so should these be run in parallel
(i.e. independantly) or in series(i.e. linked together).

tia,

Sky