I did, and he ate a little bit. But, I wouldn't recommend this if you have only one betta, and a small tank. It's meant to be for 10 to 29+ gallons of water and several fish. Also, if you use this in a small betta tank it will cloud the water a lot! I gave him about 1/8th of the block, and when I got home, it was so cloudy I could hardly see him! It may not do this if you have 10 to 29+ gallons.
I would not recommend this for only one betta.
answered 4 years, 2 months ago
1out of 1found this answer helpful.