Yikes! Could you cover the overflow with a black acrylic lid? I get them made at a plastics shop here, costs about $10.
Maintenance, stocking, and feeding techniques can keep NO3 and PO4 at close to zero levels, but not everyone wants to follow that method. Biopellets are a good option - they work just fine in a TLF reactor. Most of the issues with biopellets are when people use too many. A lot of tanks that need biopellets also need GFO. I prefer biopellets over liquid carbon dosing (vodka/vinegar/NOPOX/etc) because there is less chance of bacteria film IME.
Quote:
Originally Posted by hunggi74
The ULR Hanna phosphorus checker turns off after 10 seconds of displaying the results as well.
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The ULR ones I've used stay on for at least a minute or two. I've not come across an ULR that turned off at 10 secs, just the LR. That's weird that they would be different. How old is yours?