Loaches are closely related to cyprinids. They are bottom feeders, which makes them an excellent scavenger for aquascapes. Be aware that loaches love to burrow into the substrate. If you decided to keep loaches, make sure that there are no shallow-rooting plant species in your aquarium. It is best to let the plants grow extensive root systems before adding loaches to the aquascape to prevent uprooting of the plants.
Another caution is that some loaches, particularly the larger sized ones, eat shrimps. It is not recommended to keep large loaches with shrimps.