I have a aquaclear 50 on my 30 gallon tank. Earlier today for the second time in a few weeks on of my smaller apple snails climbed onto the inlet tube of the filter. The get stuck there because of the suction im guessing and die. My question is can i modify or is their something I can buy to put over the inlet tube of the filter. I have three more snails and don't want this to happen again if I can avoid it. Thanks