Thank you. It is clearly more complicated than I assumed. If one were to add 1 ppm of urea to water, what ppm of CO2 would be released as the urea hydrolyzed? I'm asking to get a feel for whether this has any chance to be a significant contributor to the CO2 in the water.
You're most welcome. You'd get the same concentration of Co2 as urea due to the same stoichiometry. I.e. 1 ppm, not significant enough overall.
Another update: I only noticed pearling in the area where I added the dissolved urea (near the return from the filter) so it seems localized. The other side of the tank did not have any pearling so I added one pellet to the other side (other side of the return) and some time later the baby tears are pearling as well. So the Co2 released it seems to have a localized effect. The return from the filter is directed somewhat upwards so there is probably reasonable flow. I assume once urea is dissolved it should assume the density of the water so I am not sure why this happens.
The question is why the pearling now? Is ~0.25ppm Co2 enough to sustain photosynthesis for 5-6 hours? Or did it just kick start everything? (induced protein synthesis????)
we can end this debate now, i am here to only help our TPT members and in return i haven't ask anything else, no money nada nothing. Tobi's was very smart and i would say clever to use the Ca Mg nitrate to provide Ca and Mg, nitrates are highly soluble while Mg Ca sulfate struggles to stay in the solution, if you or others feel that whatever am doing is exact copy of his fert then we can stop it here and we can request the mod to close this thread.
i admire Tobi's work, i have learned some stuff from him, if he was here on TPT forum i would personally thank him. but his work also came from other sources, i also looked at many sources including his work, pmdd, KEKON's work, there are many members who are involved in it.
if you still feel that this is his copy then find me a different source of Ca and Mg which are highly soluble and are not based on sulfates. this will make the ingredients looks different on the paper, resulting in completely different fertilizer, but with same concept, just like any other fert. the plant will still respond and grow.
i am working on next release which will include at least 0.30-0.40ppm of Mg and 0.50-0.70ppm of Ca, based on my research plant can use anywhere between 0.50-1ppm of Ca and 0.20-0.50ppm of Mg per day. this will also decrease or limit the needed for GH booster etc, also resulting in less need for water changes.
last thing i want to say is that thanks to everyone who are trying the fert and testing it. this is only beneficial for our TPT community.
The use of Mg/Ca nitrate predates every aquatic plant fertilizer. Please look up Knop's nutrient solution. It was developed in the 1860s or something. Tobi's fertilizer and the fertilizer listed in this thread is a slightly modified Knop/Hoagland solution (macronutrient wise). Not to downplay his and your contribution in making it popular but not completely original.
What is the purpose of ascorbic acid and potassium sorbate? Not for preservation I presume.