I'm having a bit of trouble with my plants after re-scaping my tanks, would love any input anyone might have. The trouble is in the tank with sand substrate, I put in two bunches of Ambulia which in the past has done quite well in this tank, both planted and floating. These lots, which went in healthy looking (and from the same shop I've got it from in the past), but soon started dying away. I pulled a few stems out of the sand to float and they just continued to die. I tossed a half dead stem into the goldfish tank (gravel bottom) and started seeing new shoots emerging in a few days, until the Goldies ate them! Parameters in the tank are good, Ammonia and Nitrite at 0, Nitrate got to around 40+ before a water change (I had underestimated how much of the Nitrate the plants were taking up before re-scaping!). pH did have a swing up to about 7.8 before being brought back down to 7.4 the following week, which is where it had always sat before. So, why won't these plants grow?! The sand is regular play sand which I washed thoroughly before putting in, there's a new (to this tank) piece of driftwood, but otherwise, all else is the same, same fish, same filter, same water, same light, same minimal dosing of Flourish. Any ideas? Thanks!