when to clean tank?

[Lija]

Cory https://www.northerngecko.net/#/category/272 wipeout 1
but I don't like exo terra cleaner, it's gello like. they also have exo earth very cheap, and other stuff, but to get free shipping you gotta have 100$ order, so im just getting stuff for that amount .

That zilla cleaner is spray, feels like windex, but less intense.

[monster]

Thank you once again, your help is always greatly appreciated.