Ok I get the pod part, Its much easyer to culture your own phyto than paying rediculous prices for such a thing. I would use the DT's you currently got. There is no dissadvantages to dosing phyto that I know of. All you need to grow your own phyto is a starter culture, 2litre bottle, rigid tubing, air pump, F/2 (fertilizer can be found at reedmariculture.com or floridaaquafarms.com I believe) and a light source. Heres a quick vid of my phyto and rotifer cultures, Phyto is alittle pail because I used all but 1 bottle and split it between 4.
[YOUTUBE]http://www.youtube.com/watch?v=iow6GkuhlYs[/YOUTUBE]