I just went and talked to my LFS guy (he is next door to the animal hospital I work at, so our businesses are close). He is awesome and guides me. He said that goby would be better for cleaning my substrate. Now to decide which goby is like.
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A mandarin is a VERY specialised feeder,as hard as seahorses almost. Scooter is much easier, but Id still give it time, as they do need pods as well. but will take frozen easier.dragonet blenny vs mandarin goby
If you are looking for a sand sifter. Diamond goby all the way. Their faces are buried in it all day. They will also eat a ton of pods out of the sand. BUT, your sand looks very coarse. It will rip the gills apart. Looks like you have a black Hawaiian substrate? There is a certain diameter that is best not to go above. Fiji pink I think would be the highest. Crushed corals and aragonite is to jaded. Just a heads up so we stay clear. Use dragonet for the red, green, and spotted Mandarin. Also scooter, red, and ruby red blenny dragonet. From what information I have gathered over the past year. They are neither a blenny or a goby. Also one other thing with the pods you get in a bottle. Aside of it going to cost you $40 a month for 2 bottles. It is either the alkalinity or salinity that make them not survive in our tanks. They are raised in a lower one of those 2 things. (Probably salinity to keep parasites & diseases at bay). So they only last 2 weeks if they are not eaten by them. Some will go hiding deep inside your rocks. That is nutrients you don't want. Plus they eat each other in the bottle. Adding ammonia, phosphates, and nitrates, because die off of them. Use a mysis net to pour the pods in. So you don't get that water in your tank. I can't imagine that being to fun, being so microscopic and wanting to latch onto the net. If you don't have the time to target feed for a good 6-8months, for a spotted dragonet. Stay away from any dragonet. Salty never mentioned he had one or experience of one. Just the normal of caution that you read about. No offense Salty. If you see a spotted feeding. I would give it the thumbs up to bring home. I was all panicking when I brought mine home for the first week. Called up the guy I bought it from. Is it cool if he is swimming up and down the glass and all around the tank not looking for food? He said"relax that's just him being a fish. They don't eat all day 24/7." Remember it is diet. Over feeding fat and happy can be unhealthy too. Vita Chem and mysis w/spirulina is plenty for them.