Re: Is algae benefical or harmful in my axolotyl's tank?
Is it possible to put plants in a tank that is already established? Or do you have to start over so that you can put dirt in?
Nope, there are some plants that don't need to be rooted in substrate.
Axolotls have a reputation as amateur landscapers, so plants that grow in substrate risk being uprooted. Plants with rhizomes fare better, as these can be attached to driftwood and rocks.
Some people plant theirs in plant pots, or pyrex dishes. (There was a really neat idea about aquarium-safe-siliconing pebbles to the bottom of these as "feet", and the gap beneath doubled as a hide!)
Because Axolotls don't like a lot of light, you're kind of limited what you can have in your tank. I set up my tank for axolotls (but switched to fish because I didn't know if I'd be able to commit to something as long-lived as axies and would have the space for their tank) so I have Java Fern and Anubias attached to mopani wood. Java moss is also generally good, and marimo moss balls (a pretty kind of algae!)
I'm a beginner to aquaria, and my plants are thriving (I noticed a new flower growing on my Anubia when I changed the water today. Or it's a new leaf roll. I didn't pay much attention). They're apparently quite hard to kill off.
Amazon frog bit is also meant to be good for providing surface cover, but I'm waiting to get some at the moment, so don't have any experience.