Even if you were talking about Crenicichla, (which are cichlids) this is the wrong forum...We have a Creni sub-forum for those...African pikes are not cichlids..I think you would get better responses in the 'other monsterfish' sub-forum And no I do not think a 5x2x2 is big enough for one adult African pike....If you did mean Crenicichla, the sky is the limit with that tank size....