It depends on how high the nitrates climb, really. If you have a 10 gallon with 5 dwarf shrimp in it, the bioload would be so small that the nitrates would rise very slowly as opposed to a 10 gallon that has a Betta and 2 snails and 6 neons.if you didnt know you were supposed to clean the filters out with tank water? does this mean you dont add tapsafe when you do water changes. so many people think its a good idea to clean out your filters weekly and do 50 percent water changes weekly. simply just have to clean your filters every 2 weeks to a month! but there are many people who would disagree with that. and only need to do a 10 percent watwer change every week. this keeps the fresh water coming in on a regular basis. instead of once a mon th. but again there will be many people who disagree with that. sounds like your tank never fully cycled before you added fish. and seems as you werte cleaning out your filter with tap water. its possible your tank has never matured properly?
Also, if you only do a 10% w/c weekly how well would you be able to clean the gravel. All this organic matter of fish waste, uneaten food, rotting plant debris would raise your nitrate quicker than you can remove with weekly 10% w/cs!
Doing tank maintance your way you'd run the risk of creating old tank syndrome, even if you clean out the filter every week.
So I would not advise this kind of practice to a person new to this hobby. Especially since over feeding is a common mistake made by newbies!
It is good advise when you wrote to clean out the filters in tank water, to never use tapwater! There even are people that recommend cleaning the filter out with fresh dechlorinated water. They compare it to cleaning dishes in dirty dishwater!!!