They are great quality, but even such this Is a small variety of shrimp, and will be only 1/4 to 1/2 or so, maybe bigger but not much.
Get like 30 in a 5 gallon and it would look great.
Tbh with these guys order more than you need, they are sensitive. That being said, the seller sent me.mine and ALL were live, its been MONTHS and most are alive.
I was having the same issue in a very well planted aquarium. I got a good test kit and found that the pH was too high and the water was too alkaline. So, I have been slowly adding substrate and driftwood pieces that will bring the pH down and used a water softener pillow. After about a week, I think I am seeing berries - no little ones yet, but I am very hopeful.
Sounds like problems with the water conditions. Your tank should be cycled and "aged" before introducing new shrimp. Even though red cherry shrimp are known for their hardiness, they still need good water conditions.
Constantly, I started with a dozen last July, now I have hundreds. Just started a new tank just for them. They have almost 0 bio load, however they can be very sensitive to nitrates. If I don't do water changes twice a week I almost always lose a few. But these are my favorites!
Five or 12... probably doesn't matter. Before you know it, you'll have a hundred. A month after starting with 12, I thought I lost them all. While removing plants for cleaning a month later, I realized they were all in hiding and had already tripled their population.
Comedy hour? Seriously, dogs don't come with dog houses, cats don't come with cat boxes, and fish/invertebrates don't come with fish tanks.
It is expected that the new owner has not only provided a sufficient tank for the shrimp, but that the tank has also been properly cycled and aged in preparation for the shrimp.