My corkscrews are kept at around 80F now, when I put them in when setting up the tank it was around 83F, took 2-3 weeks for mine to really rebound, now they're all nice green and healthy. No CO2 for mine just liquid plant food every couple weeks. 29G under 2 T5's 1 6700k 1 10000k. When I first got them they only had 4-5 leaves each now thats doubled, haven't grown as tall as I thought they would though only only about 12"