each time i do a gravel vac i get about 15 or so trumpet snails in my dirty water and im sure there's much more in the tank itself, also when looking into my filters there's always 1 or 2 in there just hanging on the filter pad... ive heard many people talk about how they are horrible for a tank and how they can kill your system? is that true, asides from the eye sore from one i see once in a blue moon gliding around the glass are they really that bad? i mean they eat the food that the fish dont eat and i can assume they produce waste that i just vac up on my weekly change... to me i dont see anything bad about them because there isnt much and ive noticed them from a long time ago. should i be worried? or should i just leave it lol