Is it possible to run both?  I've seen that it isn't, but I have a friend running pfsense, with pihole as the dns server and pihole with pfsense as the dns server.  It seems to work without a loop...  Is this right?
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Shurato, Sysop Shurato's Heavenly Sphere (ssh, telnet, pop3, ftp,nntp,
,wss) (Ports 22,23,110,21,119,8080) (ssh login 'bbs' pass 'shsbbs').
*** THE READER V4.50 [freeware]
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 * Origin: Shurato's Heavenly Sphere 
telnet://shsbbs.net (1:340/1101)