I try to avoid touching them as they absord things through their thin skin. I have plants growing in potting mix so I have covered that with fine gravel to keep them away from it and I change the water every week or so. Mine has a small filter in the water but you need to make sure there is not much water movement blowing them all over the place. When young they hardly go near the water but are in it a lot when breeding. All about balance ---the more you have and the smaller the container, the more work to look after them. This morning I had 36 young ones in a 10 gallon tank but at that age you never see them in the water. They are mainly fed fruitflies, aphids and whiteworms. My breeders are fed on the land and in the water so the water gets dirty a lot quicker. I find the work is in looking after the babies which have not morphed--stopping them eating each other, feeding them well and keeping the water clean. Once they morph they are as tough as.