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how's it going Rob here. I just got my 125 gallon tank up and running for my tilapia. I had the external filter on but wanted under gravel filter. I paid 60 bucks for it is under gravel filter and this is what I found out. Tilapia when they make their nests clear off the rocks so the female can lay her eggs. Well my big monster tilapia clears so much that it defeats the purpose of having under gravel filter. The day before I shot this video I went ahead and leveled out all the gravel. And by the time I came home from work the next day a whole plate of the under gravel filter was uncovered again.

Thanks for watching.

 if the information helped