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I personelly think that the 1 inch per gallon rule is getting a little old. This rule especially does not apply to larger fish such as big cichlids that demand to have their own territory. But with the fish that you are planning on keeping if you do water changes of 25% once a week and you have good filtration you should be fine going over the stocking limit a little just be careful that you dont overstock the tanks or else your ammonia will hit the roof, your ph will dive and many other things will get messed up. Good Luck!

One inch per gallon is an annoying hang on from the old days...no one quite knows how old it is in fact .
A better stocking "rule" is to consider surface area. A 29 gallon is a tall tank, a 30 gallon is a long low tank. Only one gallon difference but the surface area difference is signifigant and therefore the two tanks can have vastly different stock.
Personally the tank seems quite stocked to me, I certanly wouldn't add anymore . However some of your fish are light waste producers, others are heavy waste producers (one of the reasons the 1" per rule is so difficult to follow). Filtration should be 7-10X's per hour minimum. NitrAtes will depend partially on your maintence routine, and the plant consumption. However nitrAtes arent the only cause of stunting in fish.
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the one inch per gallon rule is an ever on going never ending battle.

another question others may ask is about filter size, and possibly how many.

i say myself that the rule can be broken. i had a 25g setup with about 100 guppies about 1 inch long. i had 2 filters running with it. i did unfortunetly lose them, but it was for other reasons and not over stocked.

but as long as the tanks established and you didnt add them all at once, and keep good filtration and frequent water changes. you should be ok

Fish tanks are an expensive addiction

How long has the tank been setup and when did you add all your fish?

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