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How would you keep plants like these on the bottom of the tank?
http://www.bigalsonline.ca/BigAlsCA/ctl ... airgrass35

I can't figure out how to attach a suction cup, but they just float to the top...what should I do?

maybe drill a small hole in them and hook the looped part of a suction cup to it? Maybe aquarium silicone the base of them to a suction cup... Glue some small rocks on the very bottom of it.

I'm thinking the same thing with no sand or no gravel it's hard to keep fake plants under...

Get big river rocks and just bury them under the river rocks. My whole bottom of my tank is river rocks and I have the plants buried under the rocks.

See

Those type of plants, if I'm not mistaken, are made for fry to hide in and are very small. You'd have to get something bigger than that. Then you can use silicon to attach them to rocks etc to weigh them down.

I got one of those little plastic flower pots the live plants sometimes come in, put the plastic plant in it, then glued some river rocks into the pot with the plastic plant with aquarium silicon to weight the whole thing down. It works pretty well. Spot pushes it around the tank to suit his taste but he can't knock it over.

I use aquarium silicone to glue a really flat rock to the base of plants like that to weigh it down.

depending on the size of your turtle it may not be a good idea to use fake plants at all. If they are able to bite off chunks of the fake plant for no better reason than boredome they probably will, if they are able. i strongly recomend against fake plants with turtles, and instead recomend live aquatic plants, or placeing a few house plants around the outside of your aquarium.

If you use plants with leaves that are too big for the turtle to eat, I don't see why they'd be a problem, even a leaf did come off. I use both live and plastic plants in my turtles' tanks. My turts don't bother with the plastic ones and use them only to sleep in and rest on. The live plants are another story---there are some pretty sorry looking water hyancinths currently in their tanks with all the undersides chewed up.

I believe I have found the best way to do this without silicone or weights.. I was in the same problem as you and the guy at the pet store had a turtle as well... he told me this... those plants if you pull them from the base where they attach to the thing that goes under the gravel they pop out.. so once you have them popped out you can buy the small (not the big ones) suction cups that are meant to attach to the side of the tank and hold the tubing in place.... after you buy those suction cups pull the ring that attaches to the suction cup out then take the plant and stick the base into the suction cup and your done.. this works very well and I am using it right now and I have never had a floating plant as of today... I believe this is the best way to use plastic plants... not only that you can pick any plastic plant you want and use the suction cups it gives you more verity when picking your plastic plants

I've used suction cups as well. Some plants fit into them better than others. (Unless you have suctions cups of varying sizes.)