Re: 260 Gallon display viv
If you can't heat the entire room, try a soil cable. For acrylic, any direct heat application is not recommended. Another option might be to use a small (2" or 3") inline fan with a heating element and rheostat to blow warm air into the vivarium.
0.0.0 D. tinc Azureus
0.1.0 Velociraptor sp. micro furry purring
0.1.0 Amazing spouse