Can anyone tell me what this is? This has shown up overnight on a few of my plastic plants. I am very new to fish keeping and have 2 marble mollys, 2 mickey mouse platies, 3 serpae tetras, and 3 bumble bee gobys all in a 10g tank. I know now that the gobys shouldnt be in there and am trying to figure out what to do with them. Also this tank has only been set up for about 5 days.