Hello, all! I have a 20-gallon tank and its filter is finally (read finally, finally, FINALLY) cycled! I think the nitrate is at about 30 ppm (I was having trouble reading the test result, but I'm 100% sure it was orange and not red, like the 40 ppm result) and the ammonia and nitrite are both at 0. I plan to put 6 guppies in the tank. Not more because I don't want to have an amount close to the filter's full capacity, in case a fish dies and causes an ammonia spike because no one sees the dead fish right away and because I don't want to do more water changing lol. But can I add more without getting close to the filter's full capacity? Is adding two guppies, testing every day for 3 days to see if the parameters stay good, then adding two more, then repeating that process and then testing for 3 days after adding the last two a good pace? Is nitrate too high to be safe for them while they're getting used to the new tank and new water? I plan on trying to lower it as soon as I can regardless of when we put fish in there. If it's too high, how big of a water change should I do before putting fish in?