very nice mate,
dont be to worried about the free auto seed, you could even grow it near a window as it will grow under any light schedule, from my own experience i have found that they grow much better with a dark period, when i first started growing autos everyone said they grow best under 24-0 from seed to harvest, well i did that and was dissapointed with yields between 3g and 14g dry, so i played around with the same strains and grew some under 12-12 from seed to harvest, then i was shocked to find that the plant grew like crazy and produced over 2.5oz dry, other auto strains gave similar results, so now i use 18-6 or 12-12 from seed to harvest and now the results are worth the time taken to grow, i certainly wont use 24-0 again for any autos, it keeps the plants small and yields are way to small,
i think autos mature due to age in light hours and not age in days, if it was age in days then they will not flower under 24-0 as they would not know what a day is, so giving them a dark period slows down the rate it matures but it dont slow down growth, so constant light makes them start flowering sooner and reach harvest soon, but giving them a dark period each days makes the grow time a bit longer but the plants gets much bigger and yields are more than worth the extra time, i was going to give up on autos until i threw some in when i was flowering my other plants as i then found out they can produce well,