I have two ottos in my goldfish tank, they have lots to much on, too much. I still have to clean my ornaments and sides of tank but the ottos love it in the 30 gallon tank so not going to move them to my tropical tank. I have had no problems with their health in any way but you never know, only having him for 5 days, must have been ill when you bought him, you never know. They are pretty hardy algae eaters, i find.