I had some plants in my ten gallon that I just took down and I added them to my 155 but someone keeps digging them up each night. I'm pretty sure of the culprit a Cactus Pleco that has been in the tank for almost a year and I know I've seen it digging in the substrate at night which is the only time it comes out. But I guess my question is how do I keep my plants planted in the substrate it's just plain gravel because that's how that tank has been set up since day one two years ago and it's a very small layer of gravel because I underestimated how much was needed for the tank. Also the tank has an undergravel filter I hate the thing but the person who had the tank before me glued it or something to the tank because I could never get it out. So is there anything I can do for my plants? I've thought about get some pots and planting them but I know there's not enough gravel to plant them in the gravel so they would have to be visible and I know the other person in on all this wouldn't like that so is there something else I can do to keep my plants planted?