Plant in question is java fern. Tank is a low tech community tank with fert dosing. I spotted these on the underside of three of my java fern leaves today, so very localised. Wondering if they're eggs or something? https://dl.dropboxusercontent.com/u/2793861/2013-09-16 20.34.17.jpg They're a dark red/terracotta sort of colour, and appear to be mounds made up of tiny particles. Are they eggs from something in my tank? Inhabitants are... Amano shrimp Otocinclus Botia Striata White Cloud Mountain Minnows Cardinal Tetras Galaxy Rasbora Malaysian Trumpet Snails. Any ideas on what these might be? Thank you!