i just came home with some rotala indica. it came with a lead thing around it to hold it together and keep it down. so i take it off. im supposed to take it off right?? i spread the stems out about .5 to 1 cm apart. i stick them in the gravel about an inch. they float out!!! and when i get a few to stay down, the next one pops the rest out! i'm new to this planted tank stuff but it seems so silly that i cant even get the stems to stay in the gravel...