Trouble with phosphates, etc. ???
Try supplementing tank filtering system with Poly-Bio-Marine Polyfilters.
Once had a terrible Cu problem...but a few of these and a couple of weeks later, tank was clear of.
In Nano, I put about 1/3 of one in center rear chamber.
I put other pieces in filter socks on main drains from tank in 125.
Will turn different colors based on what it is primarily absorbing out of water column. Thus providing another "early warning" system if problem in tank.
Blue Copper
Red Iron
Green Free Copper ions
Brown Normal organic load
Black Heavy organic load
Product Report Poly-Filter Drs Foster and Smith (DFS)
Poly-Filters
* Multipurpose chemical filter media helps improve water quality and clarity
* Highly absorbent pads remove ammonia, heavy metals, phosphate, and more
* Cut to any size or shape to fit any pond filter
Highly absorbent chemical filter media pads quickly and efficiently remove impurities, medications, and phosphate from pond water. Simply cut to any size or shape to custom fit any pond filter. Rapidly improves water clarity and actively removes harmful organic and various inorganic waste buildup for several months. Changes color to indicate the pollutants being removed and when Poly Filter is exhausted. Will not leach pollutants upon saturation.
These things really do closely resemble that magical silver bullet we are all looking for in help maintaining tank.
Investigate.
Poly-filter 
