I got a betta fish about 2 weeks ago. So far, everything has been going fine, but within the last few days he's started twitching. He appears to be physically fine (doesn't look like he has ich or velvet from what I can tell), and he's not rubbing against anything in the tank, so I'm assuming it's something with the water. I use tap water conditioned with Nutrafin Betta Plus conditioner, and allow the water to sit for 24 hours before doing the actual water change. Can anybody recommend a reliable, affordable water testing kit (I'm in college and on a VERY tight budget), and where I can get it? Thanks!