Back pain saver?

[LuckyFishGuy]

As a Cichlid keeper I am always on the lookout for large rocks to furnish my aquarium, some that I've collected are over 70 lbs. (and are of course my fishes favorites) While in the lawn and garden section of my local menards I found these resin rocks designed to cover unsightly utilities. Man it would be WAY easier to use hollow rocks like this in my tanks. Has anyone used something like this before? What should I be looking out for in fish behavior/ water parameters to tell me that these are not aquarium safe? I bought a medium size one and will chuck it in a tank tonight.

[lefty o]

i would try to find out what they are made from. looks to me they are from recycled rubber/plastic. that would concern me as not all types are inert, and may leech who knows what into an aquarium.

[CalmedByFish]

If it does turn out to be fish-safe, this would be great, even just because it provides a lot more water volume than an actual rock. Good luck. I hope it works!