We've lost 3 cherry barbs in the last few weeks, Siran noticed that they all have red gills, so she's done several water perimeter checks over that time and everything seems normal. Our initial thought was Ammonia, the test was very slightly elevated the first time (perhaps 0.25 or less) but has been 0.0ppm the last 2 times, Nitrates 0, nitrites 0 and PH 7.0 - 7.2, temp 26c.
We've been doing 50% water changes every second week. Stocking consisted of 5 cherry barbs in a heavily planted 172 ltr tank at the time but we've since lost 3 barbs and have added a peacock eel. The tank has been active for over 10 weeks, we fishless cycled with stresszyme.
Our filtration consists of the in-built AR850 trickle filter and a 2215 Eheim, this has created a fare amount of current and we've noticed the smaller cherry barbs are having to work quite hard. We have a bubblier with an air stone for surface agitation but we've decided to aim the Eheim wand at more of an angle in hopes that it will increase surface agitation and decrease the current.
Could it possibly be gill flukes? we have no idea what we're looking for, any ideas?
We have a furry pic of the red gills if needed.
Cheers