Great question. I'd like to know also. Mo only real worry would be the axolotl getting hit by the light somehow. I was watching YouTube a few weeks ago and a guy was working on one and got a quick flash of light in his eyes and couldn't see for a while. "That's what he claimed any ways." Might want to find a way to dampen the water pressure coming out and something in front to make sure they can't get sucked into it. I would imagine as long as you took the precautions needed you would be safe. They don't really change the water but mainly kill off water born bacteria and would help with most algae blooms. Can also help ensure no diseases would transfer and of they did would be much slower.
I set it up so the outflow is just above the waterline , and it rains back down against the glass. Works great for algae or bacterial blooms. I only run it as needed, then take it out when the problem is cleared. So far i only needed it right after moving when my tanks were adjusting to a new water supply. The problem was cleared in about 3 days or so for a 40 gal tank. It works well for me because I have several large tanks, and I can easily move it around to any tank that needs it. It's a pretty good sized unit, so it might be a bit big for someone with a smaller sized tank.Cool, so for once I picked a good product... Lol what sizes are your tanks Rachel1? I'm just wandering I have been pricing 75 gallon tank packages from petsmart and Wal-Mart online. So far I have found some good deals on the tanks and stands. Might go with different lights and filters. But if I can save money on the tank and stands that allows me more for personalisation in the setups and all I plan to build.I have a sunsun sterilizer that works great. Actually, I believe it is the exact one Dunny linked. The uv tube is inside the filter , so an axolotl shouldnt be exposed unless they are taking the filter apart.
Anywhere around me they are wanting too much for too little, that or they want me to take all their fish and gravel along with the tank and absolutely won't sell fish separate. That or they have a lot of small tanks and must sell them as a lot and not as individuals. Ay least Woh dealing with a store I know they equipment will work, is new, and if damaged when I buy they will accept returns. Don't quite get that with most people now days. Some out there place a guarantee on equipment, but not most. And around me locally on craigslist what I would save on a tank, I would loose buying a stand and light source. I already know better than to rely on kit sold filtration, but with a 75 gallon tank, stand, and a t5 or a t8 light sold as a package from Wal-Mart is completely in a price range I am happy with.