Actually, for level 19, theres a faster way to complete it than getting the predator right at the start. use the starting cell to go for the 2 right cells (top, recharge a little then bottom). Once you get each of the right cells, go for the enemy's top and bottom cell (those nearer to yours) using them (just one cut of the tentacle is enough to kill). So basically now you have 5 cells while they have 2 (a huge advantage) and they are busy wasting their tentacles on the big one. You only have to prevent them from getting it when you have 5 cells while you can get yours if you want to which is pretty easy.
 "Tentacle Wars"){kind=icon}
 "Phage Wars 2"){kind=icon}