loud banging sound at night time ?

i have had this for about a week but i have not added any live rock for 6 weeks anyways my tank is in my bedroom and i hear it about 15-20 times a night.

i got fish,two cleaner shrimp/one blood and corals and 3 anemones nothing eels

what could be causing this ?

it sounds like dropping a glass marble on the floor.

 

i would check your powerheads/ pumps. i had one that was locking up randomly and it kinda sounded like that. i cleaned it all up and it stopped doing it.
although mine wasnt really that loud.

 

Sounds like maybe a Mantis shrimp or pistol shrimp to me, I've heard of mantis shrimp striking the glass of an aquarium before.

 

+1 that was my first thought also

 

Maybe the pump running dry....... i think if its not that then its a mantis shrimp.

 

i hope its not a mantis smacking the glass. But could be! If so, get him outa there.

 

He says that he did not add any live rock, so I doubt that its a shrimp. Unless it came with the sand.

 

wrong, says he hasnt added any for 6 weeks. Ide assume he is saying he hasnt added any NEW rock for 6 weeks.

 

I'd would also say it's a mantis, especially since they like coming out at night to hunt. They don't, however, hit the glass of the aquarium on purpose, the noise comes from when they smack something with their claws.

 

+1 i agree