Stocking 32 gallon Biocube

[Big_Mclargehuge]

Hey. So i've had my tank set up for about 4 or 5 months. I have a pair of clown fish, two blue gobies (were told they were juvenile zebra barred gobies they arent't), and a decent CUC. Was curious about adding another fish. I'd like something that sifts sand and is fairly colorful (if that exists) or an algae eater. I know that can be tough in smaller tank. The blue gobies aren't the most exciting but I dont want to take them out of the tank. I feel like they have earned their spot. Any help would be appreciated, Thanks!

 

[Daddy-o]

Jester goby?