what is this?

Wondering what this is growing between mushrooms

I got these snails in an order. What is on them? They are in quarantine, but I don’t want to add them to my tank if it is invasive.

I seem to have a few of these in my tank and when I get near them they close up very quickly. What are they and any idea how I get rid of? Thank you.

[Little bit of info/background]: I had this 16g tank running, empty, for months. It never had lights on, only sunlight, and I thought it was cycled based on the ammonia/nitrate being none or low. A couple weeks ago my poor clown was dying and I tried to save him, so I put him in this tank (the...

Hey so I moved my snail (I think it’s a turbo) and hermit crab from my other tank into this one. I didn’t do an official QT, I just scrubbed the shells really well in a bowl of new + old tank water and then once really clean I dunked them separately in a new dish of RODI. I thought that would be...

Hello Everybody! Happy Saturday! I hope this is the right section to post in. I recently bought this frag a couple months back from my LFS and they did not know what type of coral this is. The owner who is extremely knowledgable of the LFS is usually out when I happen to visit and the employee...

Alright so this tank has been running since July 4th, 2021. I don’t have sand in it because I am going to be moving this tank in the next 2 months and I figured I wouldn’t want to run it with sand to try and clean it all out just to put it all back in there(I know big mistake!!! Never starting a...

I am wanting positive identification on several different creatures currently in my tank… mostly because I want to know what they are and where they are endemic to. I am building about as close to a Hawaiian Ridgeline/ central indo-pacific ecosystem with all sorts of life that’s habitat/ or has...

So I may had put my foot in it when I said I've yet to get any form of algae. But can anyone tell me what this is and would a blackout reduce this? Only on the sandbed, brown sand almost. Guessing its the beginning of the ugly stage? Running LIGHT with all blues,UV on 100% and 5% on whites...

As the subject said, I was using my scrubbing magnet which had gone unused for a few weeks as we didn’t have much algae and when I opened the magnet the scrubber side in the tank had several dozen “water insects” for lack of a better word. They were NOT crushed by using it to clean algae off of...