Grindals are coming from a friend, they are on peat moss. I will try to move them over to a soil-less culture if I can clean them up... My first ever source of grindals came with like 5 worms... Took over a month to just get some visible worms, it was painful. Setting up cultures after that was much faster because I used much more worms, or even a whole scourer pad that I was using as their medium. So 1-2 weeks before they were "mature" enough to collect a chunk of worms daily. Grindals shouldn't really have a bad smell unless culture is crashing IMO, you will notice worms will try to escape the box in this case too. I use scourer pads, 3 stack high, worms in middle, top to hold moisture, bottom pad is soaked to provide moisture. Food between middle and top layer, small piece of plastic grid over food so they eat food and climb over this, all you have to do is shake this grid into a tank to feed :) Short version of it anyway. You need to mist them for a while to keep moisture in, they love moisture. Only feed enough to be eaten in 24 hours or so to prevent mold.
Paramecium is easy, how I do it is 1.25 or 2L bottles filled with tank water (no chemicals, etc), add paramecium, add a pinch of powdered skim milk (i've used full cream, skim, etc milk in the past, and this works just as good but produces a layer of protein on the top which tends to stink a bit, and have to avoid it when collecting for a feed), shake bottle a bit and your done. The skim feeds bacteria, which the paramecium feed on. I found if you mix other things into the culture you end up with infusoria of all kinds rather than tiny paramecium (which is what I wanted myself).
You can actually let micro worm cultures dry out (they lay eggs) and store them somewhere for a while, when you wet them again they will hatch and restart the culture :) I use the bread and water method for micro worms. Cut crust off sliced bread (some people cut it up, i dont bother), wet it udner the tap enough to be moist similar to battering fish, put wet bread in takeaway container 1-2 layers high. Put worms in, sprinkle some dry bakers yeast over them and your done. I find the bakers yeast helps get htem going faster, and they feed on the bread. Cultures need refeeding like once a week or so.
I'll do a proper write up for all 3 once I get my new starter culture if there is enough interest in this being an article or something?