I'm gonna have to say that 24 times in a day for half an hour sounds excessive to me, especially considering the condition of your plants- they look healthy, and I like to see people using the containerized version of ebb n flow- it's real easy to deal with especially if you run from seed, not clone.

You may end up having to put them in larger containers to avoid root crowding in there- like, 1-2 gallon pots- and flood a couple more times per 24h cycle as they get larger and use more water. That big one already looks pot-bound. Time for a bigger home!

But good job so far, keep it up.