Need help IDng things in my tank

Hi, I found the following under a rock tonight. I cannot tell if the LT invert is harmful or not. The LT invert is one of the largest ones I found and there seems to be clusters popping up everywhere. Also the 2nd critter that has been showing up everywhere in the tank. The pictures I took of critter #2 is of a black colored one, but there are also white ones too. They resemble snails without shells, but I am wondering if the large Sea Hare I have laid young-ones. Help, please.

Thanks!

 

the first 2 are aiptasia and the 2nd two are stomatella.

Get rid of the aiptasia and keep the stomatella

 

Ditto ;D

 

Yup, he nailed it. Luna

 

if you don't have anything to kill it yet and have some kalwasser around,just make some into a paste and put it on the aiptasia.it will desintegrate

 

Thank you!

I got the point. I will eradicate the culprits today. Thanks! This is the best place to get advice and direction on this fascinating hobby!

Cheers!

 

stomatellas have a half shell and can be grey,green,tan.i had a sea hare that i returned cause i did'nt have enough vegetation in my tank for it to eat so it was messing with my green star polyps all the time.keep those stomatellas.they reproduce in captivity all the time and are just like tiny sea hares.they saved me alot of money.i don't have to buy snails anymore cause i have so many stomatellas.downside i think their eating the coraline off the glass but i'm not certain its them yet.no one else has ever complained about that.

 

Thank you so much for the identification.

Cheers,

G

 

First two actually look more like tube anemones than aiptasia, judging by the length and appearance of the tentacles. But thats just my guess.