Yesh, the dragon goby grows longer, but is much much slimer and requires less space in total than a pleco.
The pleco is probably going to a LFS next friday to trade in for some tetra. Thanks though.
I think I kind of plan to do like
7x cardinal
7x black neon
7xglow light tetra
5x khuli loach
and let the dragon goby in, and by the time he SHOULD out grow the 40, i'll be able to finally get a bigger tank for him....
1x false flying fox
Then i could have room a plenty for the cories. tis why i was wondering.
Also, dragon gobies apparently typically like the room to strech out, turn, ect, but do not excessivly move and swim around, as they filter the bottom. They are brackish, which is an issue, but he's getting more salt here than he does at my local petsmart >