Thats a great idea. I use a similar feeder but with a longer flat section at the bottom with holes in the top.
For my water tanks I have a plastic tube system like mentioned above, except I used 6mm electrical glands to hold the hose in place.
Your flag idea would work a treat for mine too and save me taking the lid off so much!
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So glad I could help! I was definitely looking for "easy" and it really works! I follow your thread BTW
