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I have several snails in my sump/refugiumShould I put any livestock in the refugium?
Oh and consider a diamond goby carefully...I have one and sometimes regret it. While he's great for sifting the sand, he also prevents me from having any corals in the sand bed because he just buries them. My kids love him though, so I don't have the heart (yet) to get rid of him.
I have thought of the same thing but I love them. Goby's are my favorite fish.
Equipment has improved to allow more but the old rule of thumb was 1" of fish for every 5g of tank capacity which is just 18" for a 90g. I've kept a 90 reef before and that's probably way too much fish either way. I've pretty much always gone over but I generally been one to favor smaller fish in order to have more variety. I don't do the tang police thing but you could probably get away with 1-2. Purple is not bad and doesn't grow nearly as fast as say a Hippo. The one I have now really has not grown that much in 2 years. My hippo went from quarter sized to fat and big enough to cover most of my hand. Powder blue I have not had that long but growing like a weed. In any case if you want any tangs just buy tiny ones and enjoy them until they outgrow your tank and trade them in or move up to a bigger tank. By the old rule I should only have 40" in my 200 but way past that with a tank full of rock, a good skimmer and a chaeto refugium. Think I have 34 fish right now and to guess at least 100" of fish + tons of corals so my bio load is pretty high and yes I have had some issues but GFO and AF Pro Bio S have helped with that and a biopellet reactor should nip it in the bud. Lots of options but start slow with the fish and build up the bioload slow so your rock/sand etc has time to mature and handle it.
Pop I like the 6 line wrass
The devil lives within the six line wrasse