If it comes off, it isn’t safe for your aquarium. If you aren’t sure if it is painted or printed, try soaking it in water for awhile, then try to scrape the color off with your fingernail.

Make sure the object is well-cleaned and any stickers or adhesives are completely removed. Most rigid plastic toys, ornaments and figurines are safe for aquariums as long as they are not painted and do not have any sticker decals on them. This background was applied before the tank was set-up. The effect of the rock wall is rather permanent, but impressive as it adds dimension. Note: The tank in these photos has a custom background created by arranging and attaching layered slate with black silicone. You can use sealants to make caves from pieces of rock or rubble, glue shells, stones or other decorations together, or even to cover things like PVC or plastic “caves” with substrate or rocks to form a more natural-looking hideaway. Sealants designed for aquariums are safe for fish and aquarium tankmates when fully cured, but stay away from other sealants like those used for bathroom or hardware applications.

Silicone aquarium sealant can be found in almost any fish store and is usually available in clear or black. So, how can you get in on the action to make your tank truly your own? Here are a few tips to making your own aquarium ornaments or using non-aquarium items to personalize your aquarium. Ever have a certain look or item in mind for your home or wardrobe or aquarium, and were not able to find just what you wanted? Ever decide to just make it instead? Despite the huge selection of aquarium ornaments on the market today, this DIY approach is what many aquarists are beginning to turn to when the ornaments in the stores just aren’t personal enough for their own unique tanks.

Jellyfish tank a touch of modern.