So I got my 4yo AQHA gelding about a month ago. The guy failed to mention he is HYPP NH. So I put him on the same feed I give my mare and filly not knowing. Grass hay, omolene 200, beet pulp, and alalfa pellets. Well I started him under saddle and in one week he went down twice while riding in the arena. I thought it was just him being lazy until I finally got his papers in the mail (guy had to find them) And saw he is hypp nh. I changed his feed to grass hay, beet pulp, oats and a tbs of karo syrup. He is turned out daily on 5 acres and I havent seen him have an attack since. No trembling, collapsing, etc. Anyway I'm wondering if there is anything else I can or should give him? I'm going to get him on acetazolamide I'm hoping this week. I got him as a barrel prospect but now im not sure. I looked on barrelhorseworld and there are some highly competitive hypp nh horses running the pattern. It's been 2 weeks with no attack. Any suggestions?