never had my tanks smell.. try doing a water change.. and check your ammonia levels.. if its a "fishie" smell then it just needs a water change. see if that works.
Thanks, I determined it was fishy smell, changed water and it worked, never had fishy smell before.
no problem, good everything worked out
It was the kind that is used with gravity, and it did not work well, even when I raised tank to higher surface, suction was not that strong, it came from a mega grocery store, but same item is sold in pet stores. I bought 4 red claw crabs, found them by accident, did not know they required salt or brackish water, store did not explain their care. I have never had crabs before, and didn't know they were so entertaining!
Actually, yes, a water change helps alot but I am almost sure I've located the source finally!.... its the uneaten food/waste underneath and around the rock cave! So, that means tomorrow, I will take all creatures out and completely clean under cave and rocks. This will take a while, then I must rearrange rocks and cave and landing I put together. I have a new crab who is under part of the cave now, the other 3 were waiting for dinner and I hope he is ok. I will keep checking on him until I go to bed, then first thing in the morning. Thanks for writing about the fishy smell, now I know where its coming from and it has been bothering me.