Review on XMHF Plastic Aquarium Undergravel Filter by Marcel Snoddy

Place in 37, 30 and 20 gallon tanks. I love that you can add whatever you need for your tank size. I chose this style because each panel has a tube slot. Others under gravel only allow pipes on the back corners. This gave more options for installing tanks. The tube has been expanded to accommodate different heights. I want them to come with more whistles. Additional square-bottomed tubes are not found. My only major complaint is that the brackets hold the panels together. They come in both male and female styles and work both ways, which can be a hassle when clipping and unclipping. They are strong enough to be used in our aquariums. I twisted and squeezed them before installing and none broke.