I love my IBTanks! But I didn't like the flange thingy on the Cartos that I purchased with them. They did almost whistle, crackle, snap and popped on me. Too loud So I changed to Boge Cartos with no flange and it still snap crackles and pops but much quieter now. Now my tanks are perfect for me. I just have to make sure when filling to not push the carto in too much or liquid spills out the bottom since there is no lip to stop the carto from pushing in too far on the tank.