Starting to think about adding to a 20 gallon high. Currently in the tank are 2 honey gouramis and 7 zebra danios. I’d like to add a bottom feeder, but already have BN Plecos in other tanks so am looking for something different. I think corys are adorable, but not sure the footprint of the 20 gallon high is enough for them, and the substrate in the tank is gravel not sand. What are some other options for bottom feeders? I like shrimp and snails, but want some sort of fish - preferably something I can find at someplace like Petco since the closest fish store is over three hours away.