I can relate.. it seems like I don't have any space.. although I know I do. I find that it's easier to plant a bunch of small plants and let them grow/fill in, than just plant big ones.
When you helped me plant my 125.. I know there's a TON of room in there..but it feels like it's full.
Maybe it's also that "fish mentality" that us cichlid people keep... haha.