Goby Questions

[StartingATank]

So, I am copying and pasting from an email, so it may seem a little strange opening up. I got a neon blue goby for reference and it is about 3/4" in size. I do have some aggressiveish fish in my main tank, so I was planning on putting it in quarantine, but it is so small that it is able to go through the grates of my filter system so I was wondering what to do. I also got a midas blenny with it, and I was planning on putting them both in quarantine, but now that I see the size of it, I am worried that the midas blenny might be aggressive to the goby, so I plan on putting the blenny in my main tank. Also, I was planning on feeding mysis and spirulina frozen, but I don't think the goby will be able to eat that. The only other food I have is phyto, betta pellets (they are pretty small, about the diameter of the diameter of a wire of a paper clip, pellets with mysis that are larger but I can slightly grind them up), benereef, and pre-medicated flakes with metronidazole. Would any of these work for feeding? I'm sorry for the barrage of questions.

 

[Boehmtown]

I put my yellow lined goby in my main tank. He hid for a bit, then came out a lot , now kinda found a home and comes out during feeding. The bigger fish just ignore him mostly