Cleaning crews!

Astrea snail-algae, rock grazer. Slow but thorough. If they fall you will have to tip them back up so they don't die.

Nerite snails-glass/rock grazer. Not as thorough as astreas but cover more areas in less time. They stay mostly on the glass and get the easy film algae off before they cause a nuisance.

Cerith snails-sand/rock/glass cleaner. They mostly burrow under sand but I see them do a bit of everything. Keep the sand well stirred and eat detritus.

Nassarius snails-sand cleaner. Burrows under sand and keeps it airated and helps with detritus and leftover food.

scarlet reef hermit-rock/sand grazer. They get kind of large but are very peaceful and extremely thorough. They can get kind of annoying and may knock things over but they'll eat hair algae and cyano. Will pick at corraline too. Only hermit I even remotely like. Not too prone to killing snails.

Bristle worms-Harmless scavengers that eat dead things, and detritus. Essential to the cleanup crew imo. Will hurt if you touch it, so don't ;)

Stock as you see fit. What you get depends on what is in the tank, how much live rocks, how much sand (if any), algae problems etc. etc. . If you want some suggested stocking levels we'd need more info.

Dan
 
I recommend going with Trochus instead of astrea. They don't need to be righted if they fall. Mexican red leg hermits stay small and tend to bother everything else less than most other hermits (not as opportunistic)

maybe a small conch?
 
If you're just setting up a reef you want to really avoid any urchins or stars. They really do better ina much more mature tank .. at least 6 months if not a year old. They don't really "clean" as much as are ornamental for the most part anyhow.

After a month or two if you find your sandbed seems dirty you could look into a small cucumber but they get large eventually. No doubt there are still very cool inverts to add as decoration but just start with a conservative crew and add as needed. Otherwise they will starve outcompeting to clean the tank. No need to spoil your water to feed them either they tend to do ok on their own.
 
<a href=showthread.php?s=&postid=11717295#post11717295 target=_blank>Originally posted</a> by Packersfan21
Blue Tuexedo urchin, sand sifting seastar, Fancy serphent star.

<a href=showthread.php?s=&postid=11565203#post11565203 target=_blank>Originally posted</a> by greenbean36191
Agreed. One is most likely too many. They do such a good job of keeping the sand turned over because they're constantly searching for critters to eat. There are several species of star sold as sand sifters, and most of them don't eat anything you want eaten. Some will feed on detritus when other food is scarce, but it's not something they live off permanently. Others are so general in their carnivory that they have been used as a way to sample the diversity of the bottom. Others are extremely specific in their diets and only eat certain small snails or crustaceans that live in the sand.

In nearly all cases, a 120 is too small to produce enough food to keep even one alive long term. They eat the tiny critters that really make a sandbed work and then they can take up to 18 months to starve after they've exhausted their food, all the while showing no signs of ill-health.

http://reefcentral.com/forums/showthread.php?s=&threadid=1290068

Sand sifting stars are a bad idea.

Dan
 
Alright whatever. Say that sand sifting seastars are a bad idea, but I think they do a good job so i'm going to keep reccomending them to people.
 
And I'll keep warning people about the catastrophic damage to the sand bed and the eventual starvation they will face in captivity ;)

Dan
 
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