Arashi
I am the Loach Queen...fear me, mortal!
So, I haven't had a fish tank in a LONG time, and I've kinda forgotton a few basic things.
In our 2 1/2 gallon tank we have an outside filtration system, and in our 25 gallon tank we have both an outside system and an undergravel one. My question is, how do you know when it's time to change either the BioBags or the carbon cartridges? There's no sign of instructions on the boxes either of them came in...
![huh :huh: :huh:](/images/smilies/ipb/huh.png)