ziggnick wrote:I belive i found the answer i finally needed, the reason/s a wet dry system doesnt work for turtles is because most importantly the abundance of stuff that needs filtered out is heavy... making it sink, wet dry systems use the overflow box at the top of the tank hence never getting the crud out of your tank...end of story fx5 I will run solo
This is correct.
Also a wet dry system uses bio balls - which don't nearly have as much surface area as newer ceramic rings. You're much better off with the solo FX5.
Yes overflows and sumps work well in saltwater... the specific gravity of the saltwater causes crud and proteins to float where they can be surface skimmed off. Freshwater which has a SG of 0, means that waste sinks to the bottom. No amount of surface skimming will grab it.
Surface skimming does still work to a point...
Water is still being moved through the sump and the biological filtration will break down some of the ammonia. The problem is the ammonia source (turtle waste) is never physically removed and accumulates on the bottom of the display tank and eventually overruns the filtration capacity of your sump based bio filter.