Ok i am not expert and only just started, but info from here has been rewarding.
Tip i would give is get a co2 system (not as scary as it sounds) This link here explains
Nutrifin Co2 it all.
I bought mine from
aquatics-online.co.uk online, fast delivery.
NutraFIN
You dont need to get anything else as you can get your yeast from Tescos etc, mess with levels of sugar and water and you will have constant streams of co2.
The plants will anchor themselves over time. If you strip the leaves on the bottom nodes they will grow back as roots under the gravel. Some will float up, some knocked by fish and cleaning etc, just replant them and it will be fine. Long as you have co2 and good light you will notice a big difference in growth. I have seen the difference when not using co2 and using co2.
Most of the pinned posts have all the info you desire. As you are established it be a pain to put in some latrine etc so if you sort of copy me then it will be great. As the plants grow you can take cuttings and replant (probably within 10 days or so).
Please be aware i am no expert but followed advice on the pinned topics and found it to be working a treat. Some may disagree and if they do it will only help you.
Hope it goes well, read, read and read and you will be the next George farmer
For cleaning just go carefully, between the plants, I have knocked a few out but nothing that a replant will sort.