bad

I have had a few different pieces of coral after I started keeping reef tanks in July 2020 I started off keeping my reef in a 20 gallon tank with a hang on the back filter and a insanely low powered light. I have improved my tank immensely since then. Some of my coral are growing slowly but none...

Is this a spaghetti worm. If not can someone please identify?? Was found on the glass of my tank last night

I have a 125g aquarium, with a fluval fx4. It has a carbon filter, some filter floss(mostly for catching the diatoms), and seachem matrix media. I have a Coralife 125g protein skimmer that still has microbubbles for about a month now and it is pretty loud, but does produce skimmate. I have some...

Has anyone ever had Red Sea n03 p04x melt any of their soft corals? Every time I put it in my tank no matter the dose I see them shrivel up before my eyes and then they die soon after, I am putting it in the back of my drain box to let it mix with the water and through the sump before it ends up...

What is this?

Is this little guy good or bad? Just found him on a rock in the tank and I think saw something that looking like this one saying take it out.