Help identify these. White fluffy thing and a weird flower on sand

[thinkfwd]

So as I sit here and stay sad as I let my tank for fishless for 45 days or so due to some contamination, I noticed these two things.. what are they and should I deal with them…

Are these the cause for my fish to die off .

 

[JGT]

Sponge and aiptasia. Not related to fish dying.

 

[John Bolden]

Aspita most likely in the sand. Which is a pest anemone that bothers corals. Haven’t heard about it hurting fish. Idk about the white stuff near dunkin.

 

[TnFishwater98]

Sponge and aiptasia. Not related to fish dying.

Get rid of #2 by scooping under it and maybe something over it so it does spew a bunch of little Aiptasia’s

 

[John Bolden]

Cool sponge

 

[TnFishwater98]

Get rid of #2 by scooping under it and maybe something over it so it does spew a bunch of little Aiptasia’s

Nevermind I already see a bunch. Get rid of all those little buggers , look into a peppermint shrimp…Sooner the better
Or a Aiptasia eating filefish

 

[John Bolden]

What fish died

 

[TnFishwater98]

That might be one also, what have you added recently?

 

[thinkfwd]

All my fish died, and I added a goby, once I introduced it to my system it died itself and killed off my fire shrimp, maroon fish, 3 guppies . While I was scooping I found this moving transparent thing. What is this!?!