First off, Welcome to Reef2Reef. You are in good hands here...
Well its been up for maybe 9 days now
Red Flag here... You need to let the tank cycle.
My husband and I set up our very first saltwater tank. 75g. Well its been up for maybe 9 days now and we have 16 live rock, 1 peppermint shrimp, about 6 snails and 3 hermits. Well everything was going well up till about 3 days ago. I noticed my kenya tree shrinking/shriveled. Well in a panic I called the LFS we got everything from and explained. He said it could be stressed and not to worry. Well little did we know what aiptasia were because he failed to tell us that when he was supplying us with the live rock, but anyhow they were covered with them. So me being a newbie I thought they belonged. Well after showing a fellow reefer the kenya he said it's dying from the aiptasia next to it. I have a thousand of these things in my tank. To be more exact I have about 64 and that's within the 16 rocks and not including those I can't see but I even counted the teeny tiny ones. How do I get rid of these and FAST. I have one growing on my kenya. It's a teeny one but HELPPPPPP please. I feel horrible for not researching on my own before it got this bad. Helppppp!
Second red flag here is you need to find a better LFS. First off they shouldn't be selling the rock if it is full of aptasia. They should have paid you to take it. They also shouldn't have sold you the coral, shrimp, or cleanup crew... Your tank needs to cycle.
To be 100% honest, you got ripped off. You don't even need to tell me how much you paid for the rock, because I have an idea what you will be paying to get it all cleaned off the rock. I have a feeling they are more than willing to sell you additional peppermint shrimp, copper banded butterfly, berghia, or a concoction of different chemicals to try get rid of it. If the LFS will take the rock back, get rid of it while you can. Get clean live rock or just cycle with dead rock from BRS or Marco.
If the LFS will not take the rock back, take a trip to your neighborhood hardware store for a large garbage can and high-strength muriatic acid. Follow the steps on R2R for cooking your rocks. This MAY kill off the aptasia. I know it will kill off the ones on the surface, but the ones in crevices can live through it. We acid bathed and bleached the live rock from a friends tank after it went through a house fire and was cold for 3 weeks... The aptasia lived through it all.
If you do not want to do the acid bath, go get a package os Mrs Wages Pickeling Lime and mix it with RODI water to make a paste. You can use a syringe to kill them off one by one with this DIY Kalk Paste (Joe's Juice, Aptasia-X, etc)