small alien
The fungus is among us.
I would be carefully about making any kind of Blenny the first fish. New tank syndrome can make the first few fish difficult to keep alive, even though you think your cycle is finished. I recommend waiting awhile before adding fish. Do you have your clean up crew yet?
Yes. Also, they need some algae which new tanks often lack. Escenius spp. Need film algae, like on the glass. Lawnmowers and starrys may eat more filamentous algae.