Yes , it drives up demand , but also drives up unwanted attention . I had two friends OD last year , after i had stopped all my action , and yet i still had their family members harrassing me on facebook , and cops questioning me for hours at a time . Not cool when i was just home from rehab . <| sep |> I ' d reconsider a sponge filter . You shouldn ' t be stocking this tank very heavily as others have said there are no fish that would do well in there , and shrimp have a low bioload . A sponge filter is potentially pretty small , a powerhead or other internal filter will likely take up more space . The sponge provides the benefit of only a small line going in air so fewer unsightly cables etc . And it would provide some aeration since it ' s basically an airstone , this would be a potential concern in such a deep tank with low surface area .