Ok, this may be an odd dumb question but never tried it before. So as of yesterday i have never used an Air-pump except one hose to an sponge filter. So for filtration for two 5.5 gallon tank i got a 20 gallon rated air pump, so i could use the same pump with a T-valve to use sponge filters for both tanks. for some reason everything is hooked up and only one filter works. I can pinch the working one and then the other pump works. I am confused since these are extremely small sponge filters, so i figured a 20 could pump both. Ok my setup is just the hose from the pump, then connect to the T, then 2 more hoses running to each tank. I am using NO check valves or anything. Is that the problem. I know this may sound dumb, but as stated never really messed with aire hose riggin before. any help?