Sorry I meant zoom, not telephoto. But I disagree, of course it will get you in the ballpark, any lens will. These lenses weren't solely made for macro, they just have the capability. Far from what a true dedicated prime macro lens will achieve.
I'm far from a pro in photography but I feel that if your going to get a lens for something specific don't cut corners, and get exactly what you need, the zoom lenses are more than 50% cheaper than the prime lenses and there's a reason for it.
Also if you don't have a frag rack/frag tank I wouldn't even bother, to get good quality perfectly clear photos the object needs to be close at 1:1 (depending on the focal length of your lens). I don't like frag racks, I put coral in my tank to grow them out not frag and sell, so when trying to focus on a specific coral at the bottom of the tank its nearly impossible without blocking your light source, especially with a Avast Port Hole.
THEN, say you DID buy a zoom "macro" lens, the higher the zoom the more steady you have to be. Unless you have a tripod or some sort of mounting device forget about clear pictures because non of them will be.
