waterdrop
Enthusiastic "Re-Beginner"
Agree you are getting good advice here for your fish-in cycling situation. It can sometimes be exhausting daily work but careful water changes (done with good technique - conditioning and rough temperature matching) are your main job for the month or so it takes to grow the two slow-growing species of bacteria on the filter media surfaces. The bacteria will grow no matter what, so you don't need to worry about diluting things too much for them (after all, they are maintained in a healthy manner in a perfectly cycled aquarium that has zero ppm readings for ammonia and nitite(NO2) at all times!)
Even though your fish appear happy, your concern is making the water better to keep them this way! Unfortunately, they do not give outward signs until too late. What's going on with nitrite(NO2) in the water is that those molecules can hook up on the fish blood hemoglobin just as if they were oxygen and thus block the uptake of oxygen, in effect suffocating the fish. The nitrite locked blood has a brownish, blue-ish color instead of bright red and oxygen starvation first hits nerve cells, especially the billions of them in the fish brain. In nature, the vast marshes and lagoons help to filter and keep good conditions available for fish. In our small containers, we've trapped them in a potentially stale environment.
Anyway, you get the gist of it. Water changes are your friend and fact that you care and test will make a world of difference to your first fish that are trying to survive without the help of a working biofilter. You are the manual filter for a few weeks!
~~waterdrop~~
Even though your fish appear happy, your concern is making the water better to keep them this way! Unfortunately, they do not give outward signs until too late. What's going on with nitrite(NO2) in the water is that those molecules can hook up on the fish blood hemoglobin just as if they were oxygen and thus block the uptake of oxygen, in effect suffocating the fish. The nitrite locked blood has a brownish, blue-ish color instead of bright red and oxygen starvation first hits nerve cells, especially the billions of them in the fish brain. In nature, the vast marshes and lagoons help to filter and keep good conditions available for fish. In our small containers, we've trapped them in a potentially stale environment.
Anyway, you get the gist of it. Water changes are your friend and fact that you care and test will make a world of difference to your first fish that are trying to survive without the help of a working biofilter. You are the manual filter for a few weeks!
~~waterdrop~~
Should I check the Nitrate level? So all I need to do from now on is watch the levels of Nitrite and Ammonia and if they exceed above 0 then I should do water changes depending on the levels? I think Im all set. I definitely dont want to kill the guppies 
Good on you for taking the advice given here and keeping your tank properly maintained! It is so hard when there is so many different opinions out there, but you'll find that the people on this forum are very knowledgeable and helpful! 