A.R.
This definitely sounds like it's a teething or developmental issue. Both my boys went through phases of waking through the night. It would last for a short time and then they would go back to sleeping more peacefully. I was not comfortable to do the self soothing methods until my boys were closer to 2-3 years old, so I think the idea of the soothing aquarium for his crib would probably work wonderfully. For me, my boys were both tummy sleepers, so I would just go in and gently rub their backs. I related more to the co-parenting methods and there were many nights that they would just be pulled into bed with us. That doesn't work for everyone, but we got plenty of sleep, and my boys always woke up happy.