Tank Cleaner Fish

[Ardvark]

Got me a 64 ltr tank with various guppies.
What would be the best fish to join them who will clean the green algae off the walls of the tank and eat left over food and mess off the gravel.

 

[Circus]

I am a firm believer that nerite snails are the best cleaner creature in snail safe tanks. They would also love the harder water that guppies like.

 

[EllRog]

A sponge

 

[Essjay]

No fish will remove mess from the bottom of a tank, and adding fish to eat algae and left over food will make even more mess. Bottom feeding fish need to be fed their own food, they can't live on left overs.

For algae on the glass, you can remove that yourself. Nerites will remove algae but they poop a lot adding to the mess on the bottom of the tank.
There shouldn't be any left over food; you need to reduce the amount you feed the guppies.
It's the fish keeper's job to remove fish poop etc from the bottom of the tank.

 

[Ardvark]

Well that's me told.

 

[Essjay]

If you don't mind the extra poop, nerite snails will do a great job of keeping the glass clean. But they do poop a lot and if you have a male and female of the same species you'll also get sesame seed-like eggs on the glass and decor. The solution to that is just one snail or several snails of different species.

But as for stuff on the bottom of the tank, that's one of things water changes are for.

 

[EllRog]

Nerite snail eggs are a bugger! You can put them in a tub of water with a bit of wood in for a couple days to see if they lay any eggs. If it does, return it and swap it for a different one and try again. I've got a lump of wood in one of my tanks that gets peppered with eggs and it looks dreadful ?