careful with the rocket gar idea, or better yet scrap it. I had a 4 incher that grew to 8-9 inches in about 4 months and ate a rope fish about 3 inches longer then he was (threw most of it up later). The african butterflys are a much better idea for a tankmate but do not get them until the pikes are large enough to not be eaten (only dwarf pikes i've seen sell at about 1-2 inches long, butterflyfish which i have never seen under 4 inches would eat them right up) wait until the pikes are around full size before adding butterflyfish.