whats the best tank i can get that will fit my vtr and work well with the 15w limit? i already have protanks with airflow control and hate them. ive always stuck with an iclear 30s which i love but my subtank mini and istick 50w are arriving today so i expect the 30s isnt going to impress me anymore. i would prefer something with premade coils but a rba isnt out of the question.