I don't know if this is the right section for this topic, but didn't know where else to put it. I have a 75 gallon tank with an aquaclear 110 (w/sponge, zeo-carb and biomax) and an eheim 2217 (mech, course foam pad, substrat pro bio media, polishing pad and carbon pad). The tank has pool filter sand and is stocked with 1 juvenile blue acara, 2 juvenile bolivian rams, 1 white skirt tetra, 2 black widow tetras, and a nerite snail. I have 4 more bolivian rams and a juvenile severum to add eventually, but don't want to add until I have everything under control in the tank. I had a huge nitrite spike 2 weeks ago, which I think was caused by the fact that my tank was finally cycling and I had also lost a fish that morning, but didn't find it until later on in the day. The tank is now at ammonia 0-0.25, nitrites 0, nitrates 5. I am having a huge problem with diatoms in the tank. I keep scrubbing them off the glass and cleaning the decor because it is out of control and frankly unattractive (this tank is in the living room). They won't stop coming back and I can't seem to figure out why. I know they thrive in lower lighting, but my tank has LED lights on from 7:30 AM to 10:30 PM. Also, not from the water or substrate because all of my other tanks don't have any diatoms. Someone said it could be caused from zeolites which I believe is in the zeo-carb I use in the aquaclear. My only question would be why now? I've had the tank running for well over 3 months now. Does anyone have any advice or solutions to this?