help me geezer and dr. solo

geezer and dr. solo
i need your help. i have a 125 gallon tank with a 25 watt U.V.
sterilizer, two fluval 404's, an underground filter system with two
powerheads.
my problem is that i have 13 fancy goldfish in this tank and they are
doing great. the water is sparkling clean, the fish are healthy and all
my water parameters are perfect.
should i get rid on one of my goldfish since i am exceeding my one fish
for 10 gallon rule?? how do i decide which fish must go??? this tank
has been running for two years and there has never been a loss of life.
also should i remove my gravel (in almost 40 years of keeping fish i
have NEVER had one choke on gravel nor have i had toxic outbreaks). i
vacuum every other week and do 30% water changes every other week. i
can't imagine how pretty my tank will be without gravel.....the fish
love sifting through it and it does look nice.
any advice would be appreciated.
thanks,
overstocked in phoenix