stocking suggestions?

[Evaunitone]

I recently moved my fish from a 10 gallon tank into a 20 gallon long. My fish include 3 platies and 10 harlequin rasboras. Any suggestions on other fish I could have? The tank is well filtered and has a sandy bottom with some small river stones and a few large rocks.

 

[Brox]

Maybe a algae eater or a group of em? BN pleco Otos flying fox

 

[aquaplanner]

Some kuhli loaches, they live the sand!

 

[Samzter]

Pygmy or panda Cories.