All tanks have AquaClear filters. 18g has AC70. 3.2g and 7.5g have AC30s. The filters in the 18g and 7.5g are right near the moss.
18g (Red Cherry Neo Shrimp | Malawa Shrimp)
7.5g (Yellow Neo Shrimp)
3.2g (Pumpkin Neo Shrimp)
11.4g (new home soon for the Pumpkin Neos)