So I see this a fairly old thread, but its a new discussion for me.
I have two smallish tanks with a mature axolotl in each. I had a filter in the 40ltr tank and the two axys together tolerated it ok. They mainly stayed on the bottom of the tank though.
I had to rehome one axy as the other 'mysteriously' lost an entire foreleg. I now call them Nibbler and Niblet. I rehoned Nibbler into a 28ltr tank, only meant as an interim measure. He was fine til I turned the filter on, at which point he appeared to panic, trying to find somewhere to hide and staying very still. So since then he's been without a filter and I've discovered a whole new side to axolotl behaviour. He swims around the entire tank. He climbs into the plants. He's much more active.
So I turned off the filter in the 40ltr tank where Niblet resides. He seems happier too, and more active, making more use of the whole tank. We have yet to see if his leg will grow back though, and I'm concerned for him incase his wound increases his risk of infection.
I do weekly water changes on both tanks, Nibbler's small tank gets dirtier, and needs the change more regularly.
Question:
Has anyone else noticed a change in behaviour without the filter on? I guess the filters might be less disturbing in the bigger tanks.