I just got 3 bala sharks for my 29 gallon tank that will eventualy be going into a 55 then a 180...... they are maybe 1.5" right now not much bigger than the 2 zebra danios in the tank with them..... They are a bit skinny so hopefully ill get some weight on them so the look better.... The 55 has been set up for a few years but I need to get it off the ground and do some work on it for I put them in there with the 8" snakeskin gourami that's already in there. Also the 29 is being filtered by a fluval 205 and has some live plants and the fish are 2 zebra danios 1 BN pleco and now 3 bala sharks. How long u think they will last in the 29?