Is my tank overstocked, or can i get some more fish?

i wouldn't want to add any more because then something might happen to those fish

Yea. till ultimately the sunfish is a wee toddler now no longer extra efficient than an inch, then your tank is overstocked. The guppies, if blended gender, will reproduce speedy. The particularly wide-unfold rule of thumb is one million" of fish in accordance to one million gal. OF WATER, now no longer one million gal of tank. The gravel, plant existence, decorations all displace a undeniable quantity of water, plus optimum human beings do now no longer fill a tank thoroughly as plenty by using fact the rim (it quite is how tank producers are counting the gallon length of the tank--from backside to the rim). So technically, you in all possibility in uncomplicated words have 9 gals. of water to paintings with. As somebody else noted, the sunfish will develop speedy and ought to consume the smaller fish, plus they stay in cool water mutually as guppies and tetras are tropical and stay in warmth water. Any wild-caught fish ought to be quarantined for a month or extra to make optimistic they do no longer seem to be wearing parasites and distinctive subjects which will infect all the tank.

I am not a fish expert but it sounds overstocked already

If you truely want more then you can get more. I suggest no more than 3.

Dang u have a lot of Fish!!!!!!!!! Idk what kind of fish is that but if u see there is still room i think u can probably put 5 more