Fish Tank Update

Haven't posted much updates to my tank recently. Anyway I now have a total of 2 DIY CO2 supplies, one through a tulip shaped diffuser in the (middle) sump and another in the tank with a bubble tower. The CO2 indicator (picture, below left) seems to show a healthy level (Yellowish Green is Good!). Hopefully the plants would appreciate that and continue to grow. Another addition is a large cooling fan placed almost perpendicular to the surface of the water to aid cooling due to the hot weather. Not very good for keeping CO2 saturation high but the tradeoff is lower temperature which is good for the plants. The record low so far was 26.2 degrees Centigrade on April Fool's morning. I reckon it may have dropped to the 25s the night before ... Fish_