Sorry to hear it man ... 5 deaths out of 22 is a bit on the high side ... Otos r said to be sensitive to poor water conditions but they shouldn't die until a few days after u released them into ur tank ... Perhaps ur batch of otos were unhealthy in the 1st place?
I only lost 1 oto (out of 5) in my 2mth old 2ft tank so far. It's probably my fault for introducing 2 otos when the tank is still cycling (1+wk). 1 died; The other 1 probably suffered so much trauma tat he is dashes for cover once my light comes on - while the other 3 enjoy their new home so much that they "school" together at times.
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