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pecan2phat 03-11-2004 04:41 PM

Yellow watchman Goby question?
Am I correct that the Yellow watchman Goby are sand sifters? If so, is it wise to add one to a nano with a live sand bed? Will he eventually ingest all the fauna & infauna that makes up a LSB?

SquishyFish 03-11-2004 05:18 PM

Yes they are...and in a nano, the DSB is so finite that the populations never reach adequate size to maintain the tank. I had this discussion with Bang...short version is that a nano DSB isnt big enough to filter the tank. Due to the fact that the infauna will not reach adequate size to keep it from suffering from "lump syndrome," Nano's are the only tanks that I would ever suggest putting a sifter in.

Here is why. Sand lumps because the bacteria excretes a sugery coating that binds the sand together. This means that water doesnt flow through it and it will develop pockets of sulfides. If one of the pockets are disturbed, it will wipe out the tank. There are only three ways to keep this from happening. 1. Keep a shallow sand bed instead of a DSb. 2. Adequate infauna to move the sand around and keep it from binding together. 3. Sand Sifters.

The problem is that sand sifters will not only depleat the worms and pods in your sand, but eventually your rock will not have the pod population either. The worms in the rock will be fine, but the pods will be basically non exsistant.

I say all that to say...I would put the watchman in the tank.


kidkameleon3 03-11-2004 05:52 PM

how about a 55 with 100lbs of rock and I plan on throwing a pod batch in and letting it fester for a month or so?

reefrunner69 03-11-2004 07:02 PM

I would catagorize them as sand movers not sifters. I had one in my fuge (un beknownst to me, thought it was dead) for a couple months and did no damage. They will excavate to make their burrow, but they don't actively sift.

duaumun 03-11-2004 08:04 PM

Sorry, irrevelent, but reefrunner, what fish is that on your signature? A Goby? At least, when i looked at pictures, it looked like one. What kind is it?

reefrunner69 03-11-2004 08:29 PM


what fish is that on your signature? A Goby?
Yep, yellow watchman goby ;)

duaumun 03-11-2004 08:40 PM

YAYYYY I was right!

jackdp 03-12-2004 02:01 AM

When I had my Yellow Watchman Goby he seemed to sift sand to me. He would stay in one spot for a few minutes, suck up a mouthful of sand and then send it out his gills. He would also burrow with a different behavior. Then one day he just jumped out of the tank. They really are interesting fish just be sure to cover the tank somehow. They can be quite skittish. Now I have an Orange Spot Prawn Goby that seems much mellower, he's like a watchman on Prozac :)

SquishyFish 03-12-2004 04:05 PM


Originally Posted by jackdp
He would stay in one spot for a few minutes, suck up a mouthful of sand and then send it out his gills

Yep..thats exactly what sand sifters do.

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