I’m currently at war with Hydrocotyle Tripartita Japan. I recently re-scaped, and planned on a whole section of this plant growing in and around some driftwood. I bought 2 TC cups, broke it up into pieces, and planted it into the substrate (UNS Controsoil- Fine). The next day, it was all floating. So, I broke it into smaller pieces and planted it deeper. By the next day, it was floating. “OK you little f!@ker, I’m using lead plant weights”. I made little horseshoes from lead plant weights and “stapled” the plant to the substrate. My plan was to give it a few weeks to properly root, then remove the weights. The light came on the following morning and, low and behold, the plants were… floating again. No effing clue how they weren’t held down by the lead weights, but they managed to creep out from underneath and float away. I’ve completely given up on it at this point, and am looking for a different plant to put in it’s place.