it's a new 240.
and i was also wondering about my 40 that already has fish in it, and i got a new filter(while still running my first filter) for it so i wondered if the sunfish, guppys, and goldfish are gonna be alright or not..
but in my book it said to do atleast a 50% once a week during cycling..(??!!)
hey ian, how will i know if my fish are stressed out?
oh, and i have a whisper 40i running in the 40...i think it was very clsoe to cycling and then i got a new XP3 with a bunch of bio media.
would the bio floss in the 40i kill up all the ammonia before the XP3 sucks it up?