- Reaction score
- More than 10 years
I have a 90L tropical tank with 3 Bala sharks, a plec & several tetras, which have lived happily together for over 6 months now. I change the water by a third and 'hoover' the gravel once every 3 weeks. Temp is fine, filters seem to be fine. I noticed 2 of the sharks seemed to be spending alot of time together, then the smallest one developed a fully red dorsal fin and has since died, any ideas?