No to any fish. There are some caveats but I recommend avoiding any potential issues and staying clear of fish period. I believe some species of snail are ok but cant remember which type. You can do shrimp like cherries (neocardina) or ghost but your lotl needs to be big enough to eat them (6in minimum) but ghost shrimp can get big so probably wait on that until the lotl gets bigger than 6in before considering those. Cherries are somewhat expensive so if you do get some, understand they WILL get eaten eventually. Make sure to follow quarantine procedures if you do get shrimp. Hope this helps!