One thing I wanted to bring up on this topic. Every year around this time, my tomato plants develop a white mold on the stem. Do you think this white mold could be causing any issues with the fish (poisoning them)?
[attachment=0:t0snr2gy]mold.JPG[/attachment:t0snr2gy]
The plant is still producing fruit, so that's the only reason why I haven't pulled it out.......but I am curious to know your opinions on it.