Pump Problem

I have some Hygrophila in one tank that sounds like the type of thing you had. It grows like crazy, but refuses to put any roots into the substrate. I pull out handfuls every few weeks, it grows well when tied onto something. But you can waste a lot of money on plants that quickly die, you have to make sure you get the easy ones, not just the ones that look pretty. The easy ones are usually the cheap ones anyway.

It's the same with fish really, some will be happy in a wide range of conditions, others need special treatment which most people can't provide, but they are often bought because they look nice in the shop.