Okay, so i got the other three mushrooms from the guy/girl/letter, the trader, the laughing girl and the last one is by the demon door correct?
well i tried fishing in the ripple but it won't work.
my line keeps breaking!! so i can't fish anything up!!!
why does it keep doing that?

I'm just curious.

Have you done a lot of fishing? Like, do you normally not have an issue fishing and its just that one spot?

I don't know if your playing on xbox or pc, but i play on pc and I find that i just click once to get it going once i hear the reel and then i let it pull (the green line filling) till it stops and then i click like crazy. The only time i fight the pull is if it actually gets all the way to the end (never so far). Be a little patient some of them are a real pain but they don't usually pull for me so much, leaving plenty of time to reel in.

luck .