Hello, would a DSB with the open space under neath it all (I forgot the name) work in FW if I took some mud from a FW marsh and put it at the bottom and then the sand? 
on a side note. is vinyl plastic bad for fish tanks? i was making a Vinyl window screen bag to hold small 1-3 mm gravel that would be real deep for such a FW DSB.
on a side note. is vinyl plastic bad for fish tanks? i was making a Vinyl window screen bag to hold small 1-3 mm gravel that would be real deep for such a FW DSB.
