We have 4 chicks in a large plastic tub I had on hand. Looks very similar to the picture. But they are 2 & 3 weeks old & starting to fly around, running & jumping all over the place. Healthy & strong, but I am worried they will get hurt in the tub that now looks pretty small. The 5th chick yesterday came down with wry neck & I'm worried that they are so active they can hurt themselves. Is this tub too small to grow these girls for 3 more weeks?