film

Hello all, I'm fairly new to reef keeping, and my tank has been established for about 5 months. Stable parameters all in range, alk around 9.3, nitrates 5 ppm or lower, and phosphates sometimes on the high side of .5 (I use a reactor to bring it down below that). Salinity is 1.026, calcium...

This white film on the cord of my uv sterilizer and other cords in my fish tank, what is it? I'd assume it to be algae. I've had this in freshwater tanks before, I believe. It comes off very easily and feels slimy. Just want to know what it is, is it good or bad, and how to minimize it or get...

My 25g has been running for 2 months. It is currently FOWLR. Recently I have noticed two types of white/grey film like things growing on my rock, so could anyone please identify them? Here is a photo :

Over the past two days I’ve noticed a thin and spotty film on the surface of my RO water. Any idea what this is and will it hurt my livestock? I’ve been removing it just by putting a strip of filter pad while mixing water.