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They are bacteria and the fact is the unintended consequence of your protein skimmer/UV/Ozone is that they remove bacteria from the water but do nothing to cyano and algae that are attached to the surfaces of your tank
One of the other problems with most refractometers is that the scale displayed normally reads from 0-100ppt when we are really only interested in the region from 30-40ppt
2x Metal Screw Hook
Length: 19
which will then result in a biological balanced
Blade Smart LED Coral Glow - Aqua Illumination Size:66" They are bacteria and theExtremely Versatile Mounting, Spectrum, and Sizing Options.. Aquarium Lighting, Your Way! Available in 7 different sizes from 12 to 66 inches Balanced spectrum optimized for coral fluorescence Mounting solutions for every tank need Cluster group LED diodes with 95 degree spread EdgeFieldTM Optics with even PAR and smooth color mixing Minimal shadowing and natural shimmer Great alone, stacked in parallel, or as supplemental fill lighting IP66 Water
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