I have had my petco betta for about six months now(surprise birthday present) and of course i knew nothing about how to care for them. So after receiving my poor lil fishy in a 1/2 gal i upgraded him to a 1.5 gallon bowl. Soon after he started developing fin rot, i treated him and he got better but then a week later he would get it again, this happen for about 2 months or so.
So i finally decided to cycle him a 5.5 gallon hoping this would get rid of his finrot issues. He has been in his newly cycled tank for almost a week and this morning i discovered he had finrot again! I checked my water, pH is 8.0(have very hard water), Ammonia is 0, Nitrate is 0, and Nitrate is 0, temp is 79.
Can anyone tell me what i am doing wrong? I was thinking of dosing with tetracycline because it has worked well before, but will that mess up my newly cycled tank?