I have heard the same argument about putting DG in a 10 gallon. The reason I did not ask if I was overstocked is because there is no clear cut rule to go by. One person says to go by the one inch rule, another says that is outdated. One person says HG are good for a ten gallon and they would never put a DG in a 10 while another person says the complete opposite. From everything I have been reading both fish get the same size, have similar behavior, and are compatible with the fish I plan on getting. So why can a DG go in a 10 but a HG can not? I do agree with the pairing, I should of only ordered one. But again it comes down to every fish have different behaviors and the two I have get along. I had a pair of DG in the past and both died of Dwarf Gourami disease which I have heard is common with these fish. IMO it is just preference on which ones I like and I like the HG better. I am not trying to start an argument and I appreciate your input. I have learned so much from this site and continue to learn more everyday.
I do have a test kit and I test regularly. My numbers on my ten are 0, 0, 10.
I am cycling an 8 gallon right now and once I get that ready I plan on moving the ADF there.