Even though my underwater feeder is at the proper depth, I am getting staff alerts that the keepers can't reach it. If I adjust it any higher, then it's not at the proper depth. I've tried putting it lower. I've tried putting it on a solid surface instead of just floating. No matter what, I still get the alert. I've google the issue and even tried searching here before posting but I can't find an answer. Is there some other requirement beside the depth that needs to be met before keeper will actually be able to fill it and the alert goes away?