I saw a murti of Ganesh on the altar next to Nrsimhadeva at a neighbours' place. There was an argument between devotees. Some say that in Srila Prabhupada's Nectar of Devotion it is said in Chapter 8, One should begin the worship of the demigod Ganapati, who drives away all impediments in the execution of devotional service. In the Brahma-samhita it is stated that Ganapati worships the lotus feet of Lord Nrsimha-deva and in that way has become auspicious for the devotees in clearing out all impediments. Therefore, all devotees should worship Ganapati. Thus my neighbours placed Ganesha next to Nrsimhadeva on the altar. Other devotees cite Srila Prabhupada letters in which he says that there's no need to worship Ganesha. So what is the proper understanding?