This is an DIY Bio-Sponge filter were in with zero additional con we can enhance the bio filtration capacity of an simple sponge filter for initial cycling of an new tank or use it as and additional bio filtration medium for overstocked fish tank

In this particular video i have attached and simple sponge filter with an inverted juice bottle with lot of chopped bendy straws in to it, like an moving bed filter to greatly enhance the bio filteration capacity of the simple sponge filter