Mountain or mole hill?

[saltyhog]

Came home from work today and stopped to check the tank as I always do and found a perfectly symmetrical pile of sand about 4" in diameter with a perfect little circle depression around it. The depression is obviously the source of the sand forming the hill.

Any idea what could have made this? I thought about taking a deli cup and scooping the whole thing up and sifting through it but I don't want to disturb it if it's something cool.

 

[pshootr]

Came home from work today and stopped to check the tank as I always do and found a perfectly symmetrical pile of sand about 4" in diameter with a perfect little circle depression around it. The depression is obviously the source of the sand forming the hill.

Any idea what could have made this? I thought about taking a deli cup and scooping the whole thing up and sifting through it but I don't want to disturb it if it's something cool.

Better go outside and check for crop circles.. [emoji23]

 

[pshootr]

Better go outside and check for crop circles.. [emoji23]

Will be interested though to see if you figure out what did this

 

[saltyhog]

I would think my wife was playing a joke on me but she doesn't put her hands in my tank.

 

[Alexreefer]

Livestock list?

 

[saltyhog]

Livestock list?

Sorry, that would be helpful

Fish: Gold Rim tang, C. jordani, C. laboutei, H. mealasmapomas, P. flavianalis, P. cyaneus, M. geoffroyi, Flame angel, Exquisite firefish, Yellow watchman goby, Eyebrow barnacle blenny, Black Cap basslet

Inverts: Randal's pistol shrimp(with the watchman goby), blue coral banded shrimp, fire shrimp x 2, skunk cleaner shrimp, trochus snails, fighting conch x3, turbo snails, nerite snails, cerith snails, RFA's X 5

Thought about the pistol shrimp but he's on the far end of a 6' tank with his goby (haven't seen him in a few days though)