Since I have no relevent experience in both starting up tanks nor planting them, please ignore all my comments. I post purely to humor you all with my ignorance
First the ingredients of MG:
(NH4)2SO4, NH4Cl, P2O5, K2O, (NH4)3PO4 ...these are most of the relevent ones that I could find.
"The problem with cycling an empty or half empty tank is that there arent enough ammonia and nitrate around for the bacteria to grow."
ok, the ammonia part has been cleared up, but the bacteria we are interested in (there are 2 type) DO NOT USE NITRATE. When we cycle, we are FIRST establishing a colony of bacteria that can convert ammonia to nitrite. THEN we establish a SECOND colony of DIFFERENT bateria to convert nitrite to nitrate. There are some types of bacteria that convert nitrate to N2, but we don't need to go there in the normal aquarium.
"For the nitrifying bacteria to grow there must be nitrates present right"
Wrong. ...see above. ...oh..and do notice that there is NO nitrate in the ingredients that I can find for miracle grow. Nitrate is NO3+. Ammonia is NH3. Ammonium is NH4+. Ammonium salts that are soluble (depending on their dissociation constants) will form ammonia and OH- ...the extent is determined by Kd.
"so after 4 weeks off cycling very little has happened compared to 4 days with miracle gro."
even in a sparcely populated tank, A WHOLE LOT can happen then with 4 days of miracle grow. Remember, you need the bacteria colony to reach appreciable levels before you notice anything. That is the only reason people dump in biospira and get results in a couple days.
By the way high levels of miracle gro (or low in some cases, like high PH tanks) is very toxic to fish due to it's high ammonia and nitrate levels including Urea.
I guess then high pH cichlid tanks are full of dead fish.
so..are you about to calculate for us what the proper dosing is for this MG magic? and Urea is NEITHER ammonia NOR nitrate. Urea is a dimethyl ketone with the methyl groups replaced with nitrite groups.
That is the whole point of cycling, getting the nitrates up and then wait for the bacteria to grow in and bring it down again!!
umm..you mean nitrite?....hmmm...see above again. and not just nitrITE...but also ammonia..
You dont have to worry so much about nitrites when cycling as long as you have ammonia and urea present it will turn to Nitrite and give you the complete cycle
umm..ya you do. Nitrite is pretty leathal to fish. nitrATE is the end of the cycle.
If you only use ammonia your cycling will still be fast but you will lack the nutrients to complete the circle.
hmm..cycle. ammonia-->nitrite-->nitrate. each step requires DIFFERENT bacteria. since many of us use ammonia in a fishless cycle, I guess we all are lacking nutrients and all have never cycled a tank.
You end up with a system that needs less water changes in the first few months.
well..when fishless cycling, you DON"T do water changes. since you are using MG which has unspecified trace nutrients, I guess we have nothing to worry about as far as heavy metal buildups?
oh...and let me get out the stop watch to see how quick I get a cloud of greenwater (algae) when I try and fertalize my plants with MG