I know this might sound stupid and I'm sorry if it's been posted before, I tried searching it, but I just got back from the pet store a couple hours ago with my
betta's new 2.5 gal. acrylic tank, and my Whisper 3i's suction cups won't stick to the tank for more than 20 minutes before floating around the tank. I don't understand because my thermometer and heater are fine but the suction is just not happening with that filter. Any ideas besides putting gorilla glue on the thing to hold it in my tank? Any help is appreciated.