CBollie, your Geophagus are AWESOME! I have a fondness for Eartheaters. I long while ago, my 150 gallon was a planted eartheater tank. I mostly had plants that would grow attached to driftwood (like you do). The species I kept was brand new to the hobby at the time and not even named, but is...
Ha! Sorry, I didn't know how catfish-savvy you were. I worked in the aquarium business for, oh, about 15 years and whenever someone inexperienced came in with a "huge green cory" it usually ended up being a Brochis. I've always had a fondness for the cats and currently have a shoal of 12...
Look up Brochis splendens. They are often called the "emerald cory" but they are not corys, though very closely related. They can get about 4" maximum.