There is algae, I just don't think he's getting enough. What exactly do you mean by "blanched" vegetables?Otos live mostly on algae. If you don't have a lot of algae try feeding blanched vegetables.
Try zucchini, romaine lettuce, brussel sprouts or spinach.
Boil the vegetables for about a bit to soften it up. I had the same problem just put two pieces of wafers or vegetables hopefully the ottos find one piece.There is algae, I just don't think he's getting enough. What exactly do you mean by "blanched" vegetables?
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