Try to get another tiger if you can. But another oto or 2 would be ok as well. The regular otos seem to adjust better and may show your tiger what to eat and he can then pass that on to new tigers if you get them later. That all depends on your tank size, though.
I feed mine zucchini, carrots and cucumbers (microwaved for 10 seconds to soften them up). I use a veggy clip in their tanks. For my other tanks I use plant weights but I found that the otos prefer the food attached to the tank wall, rather then food laying on the tank floor. Which could explain why they do not eat algae wafers. If your are short of cucumber or zucchini some day, they also snack on microwaved lettuce but the nutritional value of lettuce is less.
Once these guys do well in your tank they stick around for a long time. But they are also a good indicator of your tank's health. If there is something wrong with your water, otos are one of the first to suffer. I always check my otos every morning when I turn the tank lights on. If they look well, I know all is ok.
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