ok i want to get some snails....so what is a kind that has some color...i saw a pic of a magenta snail? and he looked AWESOME! however....i do not want to be overrun with them...so is there a particlar breed that might not breed so easily? also what do they feed on? im starting a shrimp tank...thanks to mg for getting me some cherry shrimp! (i cant wait till they get here!!!!) so i was wondering if the snails would be cool with my cherrys...also since cherry shrimp are known for breeding easily...which i would LOVE to happen....everyone says get a sponge for your filter intake....ok i dont want to sound stupid or anything....but where in the world are these sponges??!? are they just a sponge you buy from walmart cut a hole in and stick it on? do they come pre made? if anyone could shed some light on that that would be great! p.s. i have a penguin 200 on my 20 gallon for my invert tank, and i have the midline strainer opened...so if i put sponges on the intake...do i have to put it on the midline strainer too? or just the very bottom? thanks to anyone who clears this up for me!