Hi. Whilst this issue has a few suggestions like a chain hanging down the problem is to not cut into the immovable filter mesh at top of tank. So you can’t enter it. I was thinking about drilling a round hole in gutter on both sides before rainwater enters tank. Normal flow goes over the hole but when it gets to a drip it runs down the hole?. Maybe a small rubber speed hump to build the drip a bit before it goes over and through hole. Any better suggestions would be welcome as my son is getting a large water tank echo chamber effect after rains finished and last remnants of water enters tank tank