Absolutely necessary in my tanks from now on. I do a lot to make sure my shrimp and snails have the best diet. Through trial and error I have found that these rocks and regular feeding of a quality food is all I need. So far. I can update long, long term, but these really work. My shrimp are molting regularly and my loss has gone way down. *BONUS, my snails clean it regularly, so that is a +++. I don't see why you would need to replace as they will last a really long time. My snails and shrimp love them! Just drop them where you want them! Great value, they work! I use them in every tank. Read more
Good value, easy to use, looks good in the tank, nice price, good for shrimp Read more
Loved this for my bioactive fish tank. The fish tank stayed healthier because the shrimp were able to get more nutrients just from a couple rocks that barely cost anything. The price compared to in store at any pet store is great and all you have to do it just clean them when you first put them in and then the shrimp will do the rest. Read more
Shrimp love it and I believe it to help them molt and gain the necessary nutrients they may be lacking. Read more
Shrimp were all over it after a couple hours. I even had a couple shrimp molt a few hours after, not sure if coincidence but they seem very happy. I have Amano and Cherry shrimp. Read more
My shrimp like them and I believe they increased successful molting in my 29 gal community tank. No water parameter changes from them either which is nice! Read more
These rocks are so tiny. I thought they would be a little bigger than what they actually were. I understand is for shrimp and the shrimp are tiny, but these rocks are even tinier a little disappointed that’s why he got three stars. Read more
There was enough for all my aquariums Read more