 How long is fresh SW good for.
I am wondering how long I can keep premixed SW. I have a large 35 g bin and I keep my SW in there, most of the time half of the water is left after a water change.
What I'm wondering is, if it is ok to just keep adding to that water?
I have another bin too, and sometimes the water sits for a month before being used.
I always have a pump running in each of the bins, and also no light.
Test always show up normal, but I just want to make sure.
I did notice somethings growing in the bin, I'll have to make a microscope slide to find out exactly what's floating in the water.
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75 G Display, 12 G Refuge, 12 G sump, 1/10 Chiller, Coralife Skimmer, 300 Watts MH 14,000 K, 356 Watts of Actinic PC Lighting, 120 Pounds of Substrate, 109 lbs of Rock.
Corals: Pumping Xenia, colt, Hammer, 4 misc mushroom groups.
Fish: 2 Ocellaris Clowns, Yellow Tang.
Inverts: turbo snails, astrea snails, tiger striped serpent star, sifting star, skunk cleaner shrimp, sally, red ball sponge, 50 or so hermit crabs | 
