Hairy Green Mushroom on a piece of live rock. Good size mushroom, little larger then a half dollar.

Nice size, right around 2 inches

FLUVAL Sea calcium buffer. Brand new, I got this as a gift but use a different brand.

Aquavitro eight.four alkalinity
Brand new, I got as a gift but I use a different brand

Coralife 65 Skimmer with pump. I used it for a while before I upgraded my tank size. Rated for 65 or less gallon tanks. It can also be used as both in sump or hang on back. Works great, I have a new skimmer for my new tank and I don't need it anymore.

Hanna alkalinity checker. Used for a little, works great. Selling only because I bought the dkh checker.