" I can't seem to get any ram horns to survive in the gold fish...

" I can't seem to get any ram horns to survive in the gold fish tank. Used to but about 6 months ago, all the ones I introduced from the guppy tank died almost immediately. Any reason ? Not a water quality issue, weekly water change. "

Goldfish like cooler water than rams horn snails will tolerate. Goldfish also like eating rams horn snails. It looks like the snails "disagreed with something that ate them!".