I’ve never had a planted aquarium before now. Always have use the plastic plants but decided to look a little more realistic with my new 55 gallon aquarium. I’m having a bit of trouble keeping some of the plants planted because they have very little root system. The crowns are supposed to be above the substrate so they want to float to the top every other day. Any suggestions on keeping these plants in the ground? These are the Sword fern variety, bolbitis difformis. The substrate is Caribsea Eco Complete, and I’m using Seachem Flourish weekly. The lighting is LED white and blue (not sure of Kelvin temp)Any tips for healthy plants ?