im considering trying bala sharks as teachers.. this fish cost me about a 1/4 of my montley food money.. easy beeing a student with expensive hobbyes..I had mine solo for about 5 months fed it feeders pretty well for about 3 weeks then starved while trying every fishing line powerhead trick in the book for about 6 weeks until I cracked and fed feeders again. Did this a few times. Once I added my other 2 tats and they schooled all 3 broke off live in 2 weeks