My tank is always cloudly lately and my rocks always covered in sand

Corn-Picker

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Dec 30, 2003
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I have; 1 cleaner wrasse, 1 brittle green starfish, about 15 blue legged hermit crabs, and 3 mexican turbo snails in my 30 gallon. All of my levels are 0 and the pH is 8.2. My tank has had inverts in it for a little over a month and the wrasse has been in for about 10 days and is doing great. I have 36 pounds on Fiji live rock in my tank from Foster and Smith.

I have a 160 gph HOB (with carbon filter) and a 300 gph powerhead, and I only run one at a time. From what I can see, the sand that the hermit crabs and other members of the tank kick up when eating never seems to settle if the powerhead is turned on. The water keeps getting coudier and cloudier until I can't take it anymore and I turn off the powerhead and leave the HOB on for a day or two.

No matter if the HOB/powerhead is turned on, a lot of the sand settles on the rock, and I can't see the rock's pretty colors (and I imagine their filtration capacity is decreased).

Any advice on what I can do to keep my tank clear?

Edit: I have about 70 pounds Tropical Play Sand in my tank, enough to make it 4-5 inches deep on average.
 
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Here are some ideas:

The individual grains in a sand bed become more inclined to stay on the bottom as the bacterial colonies on them become more dense. The bacteria in a tank can only grow to respond to the waste load, so it's possible that most of the bacteria that your tank can support (other than the stuff in the liverock) are living in the HOB filter pad.

Depending on how long at a stretch that you leave your HOB turned off, your cycle could be stalled.

In order to force your bacteria to colonize the sand bed more heavily, I propose that you pull all of the media from the HOB filter and use it as water circulation only.

Alternatively, get/rig a flow diverter for you powerhead so that it is directed more at the surface of the water, to decrease the sandstorm effect in your tank.
 
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