I have an external pump (Sequence 4200). The intake is located in the skimmer. Last spring I discovered that toads were getting into the skimmer and working their way under the filter pad where the intake pipe lives and were being sucked in through the intake and collecting inside the primer pot of the pump. Fortunately i found them before they all drowned and I was able to save most of them. I immediately put a drain grate cover over the intake opening and that seemed to solve the problem until last week when I noticed that my water flow seemed restricted. I could find nothing wrong with the pump so reached in to see if something made it past the skimmer strainer and filter pad and was clogging the drain cover. I was horrified to find 2 frogs sucked up against the drain cover. The suction was strong enough that they couldnt free themselves and were dead. I plan to upgrade my external pump to a more powerful one next year because of an expansion project we are doing to the pond so i expect that this suction issue is only going to get worse. Anyone else have this problem?