All though "algae" can grow in your tanks, the real problem is small organisms that grow there. they are micro organisms that are invisible the naked eye, and so small they go right through your system and you never know they are there. They don't grow in fuel though, they grow in water. That is true of all the things living in your fuel system. The funny part is that the thing that fouls up the system is not the bugs, it's there bi-product. IE: poop, sh_t, crap, ect... There are many ways to take care of the problem, first of which is to make sure you are getting good fuel from a reputable place, and keep an eye on your W. I. F. If you have no water in your fuel, you will have no problems. Fleetguard make a bioside, and a fuel conditioner now, and that is what I would recomend if you have any problems with "bugs" in your fuel. -Lane-