I am new to salt water tanks and I noticed a white cacoon looking thing on my live rock, so I did a search to that effect and found a thread with pics and it sure looks like the same thing a sponge, going on the third wk with my new tank 54 gal
corner type tank, been raising fish about 8 years all Cichlids a 75 gal
South American and a 55 African.
My youngest daughter has been bugging me some time now to do saltwater so she could have a Nemo and a Dori so we have two true's and a Blue hippo and a Lawnmower blenny, rainbow gramma, striped damsel, yellow tail damsel, and a solid blue damsel, I used the damsels to cycle tank, but by useing filters from my other tanks then buying new ones to replace them and about 40 lbs of live crushed coral stuff and 20 lbs live rock a canister and a 280 this tank cycled fast.
So now that I retired I have time for the saltwater never wanted to mess with it before.