Hey guys, I have a Plecostomus that I got when he was a baby. 15 years later now, and he is a tad bit bigger lol. I have a castle in the tank currently. He can hardly fit in, but somehow manages. I want to get something like a cave he can go into and found a rubber planter that would be perfect on it's side for him to hide in. Only problem is it's rubber. Is this safe for an aquarium? The description says it's made from 100% recycled rubber. I appreciate any help or advice you can offer. Thanks! God Bless!! Below is the link Tierra Verde Serenity 13.5 in. x 26 in. Slate Rubber Self-Watering Planter-MT5100220 - The Home Depot Forgot to post a pic of the tank with the castle he squeezes into. I am moving him into a new tank in a week or so. Wanted to get everything set up first, so it has time to stabilize.