Originally Posted by Tmyboy
Thank you so much for the quick response. I was wondering and hoping that they weren't bad!
One question tho: I thought sponges die if they're taken out of water? ..... and these rocks were of course taken out of water for about 1 hr. They made it somehow I guess. How is anyones guess.
I've also noticed more of those little starfish too. What kind of damage can they do and how can I tone down their numbers if they become too many?
Different species of sponge deal with air differently. The type that tends to come along on rock seems to be more forgiving in air, at least IME. The larger sponges however, do not do well in air.
As for the asterina star fish, most species are harmless, a few are harmful. I'd just keep a look on the starfish and see what they're eating and/or if they're on your corals etc. As for removing them, I have in the past taken them out manually. I'm sure there's a natural predator of those starfish you can add if you'd like....just not sure what it is.
How many are in your tank now, and have you seem them increase in numbers?