Stone Natural Volcanic Water Clarifier and Odor Remover Rock for Aquariums, Nano, 2-Pack

So impressed with how well these work! I was changing my turtles water daily bc of the smell.

Awesome

Perfect

I was hoping they'd be a little bit bigger but it does help the nitrogen levels in my turtle tank it helps keep the water quality at a decent level I won't buy them again because I need the great big ones

Did as direction said. Haven’t really noticed a difference. But all my fish got ick weeks after I put these in. There ick has NOTHING to do with these cubes. My tank had problems way before I put these cubes in. Science says these work. I’m sure they do - just not for my situation.

These eco-blocks are great for your fish tank especially when they’re cloudy as you can see the picture above my aquarium is still cloudy. When I first put the block in there you could barely see it after two or three days it’s cleared up quite a lot. I say two more days and it’ll be crystal clear water again. I’ve done water changes and all that like I said, and it still comes cloudy with that eco-block it’s giving off minerals and all that other stuff as long as you keep it by Bobo for some reason and it works great.

Ok first off, I read the instructions and then I totally didn't follow them because I'm stupid lol. That said, I'm so glad nothing happened to my fish lol. I've only been using this for 3 days now and it seems to be harmless for the fish. Especially since I didn't wash the cubes before hand. I just through them in the tank. I know, my bad. Anyway, the water seems to be clearing up. I scrubbed the glass before putting the in but hopefully this will help keep algae from growing again.Update!It's been weeks now and the algae has gotten worse. These did absolutely nothing to help. I ended up getting some liquid from the pet store to help control the issue and it has worked perfectly. Huge difference within one day. I highly recommend getting something from the pet store not these stones

I bought these for a 3 gallon beta tank. It was clear when I added them after a fresh change and it said they would keep it clear…it made the water cloudy instead. It also made the things in the tank feel slimy when I took them out! I left them in for about 5 days and started to worry about the health of the fish! Afterwards I removed them and did another water change! Thanks for junking out my tank! I changed the water and it was Beautiful, so I added only 1 back to the tank! 24 hours later it was Cloudy again! It’s NEVER been like this before! I usually do a 50 % change every 2 weeks. It might get only slightly cloudy but I like it perfect. I hope it doesn’t kill my Betta! My cat is going to be mad, it’s his fish! I’m returning this garbage… YOU have been warned!