Sorry but I have a Newbie question.
I have a 20 gal
tank that I set up about a month ago. I noticed in the last week that the water has gotten slightly cloudy with a yellowish tint. The filter cartridge in the HOB
filter seems a bit dirty. Is it OK to change the cartridge or is it better to leave it in and do a water change.
I am intending for this to be a QT
for a 90 gal
that I am currently setting up. I wasn't ready to put fish in it just yet but wifey surprised me one day with two fish, a Clown and Copperband Butterfly. So far it's been 9 days and they seem to be doing OK. I'm just trying to head off a potential problem.
Thanks for any help.