Wilted leaves usually mean either under or over watering or occasionally some other shock. Since they are in DWC, underwatering is unlikely and overwatering is actually lack of air to the roots, which you have already looked at. Just to confirm, the top of the water should look like it is boiling with air. Small bubbles are usually considered better than large bubbles but they must be breaking the surfact to make splashes. Have you checked the ph and more importantly the temp of the water. Ideal water temp for DWC is 68 deg, any higher and the water looses its ability to hold oxygen rapidly. This can show itself as wilting. ph could also be an issue though nute deficiencies are usually the first symptoms not wilting of incorrect ph. The recent change they have had is the change in nutes so lets consider that as a posability for the problem. Have you checked the EC/PPM of the solution I dont like to see an EC of more than 2.0 (1800PPM) I really dont thing the fact these are flowering nutes will be a cause though since all that has happened is the levels of PKN have changed. Other factors could be low CO2. Are you replacing the air often enough? In a room without AC, air exchanges should be at least every 4 mins, especially with larger plants who deplete the air of CO2 faster than small plants however this is unlikely to be the cause since this would effect all your plants not just 2. If this were my grow, I would measure everything zonally, EC/PPM, ph, air volume and maybe even switch the plants around to see if you have some odd micro-climate going on. The solution will probably be something silly! Green mojo for your girls. W
