May I ask what species of crypts you currently have in there?
Also as a side note, the glosso around the hygro is starting to grow upwards because it is trying to reach the light. My suggestion is to quickly trim those that are acting like that, or else it is going to get REALLY annoying.
Also be sure to thin out the glosso too after a while, as the runners under the top leaves would start to grow upwards and it is a pain since the glosso runners would start to be not on the substrate but hovering above it. So when you do a trim you basically kill everything. Learned that from experience. In severe cases, you even have to pull the plants out to replant it.....not fun at all.
Anyways, good luck!!! Great stem plant growth!!!