Review on Penn Plax PBV14N Feeding Blocks by Renee Walters

I bought this for my collegiate cockatiel as I didn't want to take it on a 4 hour drive during a one week break. Although this is for a larger tank, I figured it would be ok if I cut it in half. When I came back my fish turned white and swam on its side even though it was still alive. I immediately changed his water and made sure the tank was clean and luckily he was revived. Warning: Do not buy this for a smaller tank (I have 3.5 gallons) even if you plan to cut it in half.