Really wasn't sure which section to put this under but figured it was best here! First things first, the tank specs 180L Trigon 180 aquarium lighting 2x28w T5 + 1x24 T5 Photoperiod 9 hours CO2 injected (drop checker lime green) JBL aquabasis substrate capped with silver quartz gravel. Temp 27 - 28 degrees Ferts as per EI The tank has been running for 18 months and I've noticed my crypts (wendtii & cordata) have thin white roots growing upwards out of the substrate. The plants are growing fine but the roots are meant to grow down no? lol I'm not overly concerned just wondered what peoples thoughts are on why this happens. I always used to get this happening with balansae too when it got going. Haven't noticed it with any amazon sword species. Any ideas? :?