My 5 gallon tank has been running for about two months now. I have an anubus plant attached to a lava rock and about one month ago I noticed these white calcium looking things appearing on my plant. At first I thought it may be ich clusters or something but my fish is perfectly healthy and never developed ich. I thought nothing of it but after doing my weekly water change and tank clean I noticed that these deposits have started appearing on my tank glass and inside my filter intake tube. Im curious now as to what these deposits are and hopefully they are not bad for my tank but maybe beneficial. Has anyone else had these appear on their plants or tank glass? Maybe someone can tell me what they are. Here is a picture of them growing on my anubus plant.