Yes, the reservoir is 7.5 gallons; its a Hydrofarm MegaGarden grower.

I figured it would provide enough room for 4 plants, but this is my first grow so I could most definitely have calculated that decision incorrectly.

I waited until the plants were 22 inches before moving the 4 plants to the flower cycle, and was given advice by a local grow shop to give the Bushwhacker the first 2 weeks of flowering to reduce stretching.

The last reservoir change was the second week with the Bushwhacker, so I won't be using that any more.

Other than the curling leaves on top, the rest of the plant looks healthy, not to trivialize the problem though -- I desperately want to solve the problem before it totally destroys my babies!