Soshrimp 3 Pieces 5-6 Inches Long Natural Cholla Wood for Aquarium Decoration by

Placed it in my tank after boiling for a couple hours. My shrimp practically ran to it.I would use these in 20 gall or smaller due to their size.

SHRIMP LOVED THESE

Drilled a 1.5" hole down the center and put my filters intake into it. Hides the filters long intake tube perfectly. Snails seem to love it, as soon as I put it into the water they slid towards it. Must give off some flavor they like. Came in three different diameters, shrimp really love the bigger one because they can run through the center.Only downside is they float, so you gotta shove them into the sand or do something like I did with the filter and one stuck underneath at a perpendicular angle.

Update:I've been using these to anchor my plants now for months, and they are doing great. The plants are so healthy, I have to trim them every few months so they don't grow out of the top of my 29 Gal aquarium. When I had plants anchored in my rocks, they would die back each time I vacuumed the aquarium, but this is no longer an issue. I'm trying some new plants, so needed a few more pieces of wood. I've found that I can use a drill bit to carve out larger holes in the wood for my plant roots. If you use a toothpick in the existing cracks around the hole you carved, it will make the hole a little larger so you can insert the plant roots, then remove the toothpick, and plant is very secure in a decorative anchor.Love these. You do need to soak them a few days to make them sink, and I did notice some tannin colors leaching out in that water as I changed it daily, but that small inconvenience is well worth it. I have checked my PH as I have bought the Cholla wood before, and it seems stable quickly, but do check your water PH (as always).My guppies loves these and the babies hide inside. The main reason I love them is that they have little holes in them and the wood is soft, so you can easily use a knife or any hard object to scrape in the hole to make it big enough to insert plant roots. Once you have your live plants anchored, they grow really well, and vacuuming your tank is a breeze, since you can just push all your plants anchored in the wood (and not your rocks) to one side of the aquarium and then vacuum the rocks on the opposite side of the aquarium. Many times in the past, I have had beautiful plants and when I vacuumed, I would disturb the roots and they would die. I did buy some aquarium epoxy stuff (for coral) that hardens quickly and is safe for one plant with a large root ball, but most of my plants will fit easily in the holes in the wood, and because the holes are long and vary in size, once you insert in the the hole where you made the larger width, just slide right or left to the smaller opening to anchor easily. Some plants are so large that they cause the cholla wood to float a bit, just push some rocks inside the cholla at the opening at the other end and that problem is easily fixed. I would give this 10 stars if I could, LOVE IT.

As others have said in reviews the pieces are a mixed bag (couple good, one ok). Do boil them a lot to kill anything that could be on them, reduce tannins and help them sink (I simmered them for 2 days). And scrub hard. Mine were very dirty, but the water soak helped loosen it.As someone else said, one of my pieces barely has a center hollow or any holes in the side.... and the another one is really too large for shrimp to appreciate, but also small enough that I worry if it was put in a smaller to medium size fish tank or a tank with larger shrimp species they might be dumb enough to get stuck inside and potentially die.For now I have them in my plant only quarantine tank just to be sure no nasties appear. They will end up with my cherry shrimp I am sure.