I just added a new goby to my pico tank. It was sold to me as a nano goby. I believe that it is Eviota spp a.k.a. Pygmy goby. It's only about 2 cm. Its maximum size is supposed to be 2 to 3 cm. I added some copepods to the pico tank for the goby. I will offer some Cyclop-eeze tomorrow.