I've been using Terrarium on my tablet and also on my Fire TV stick. It's not that good. Usually ads, annoying captcha for hosters, slow hosters and etc. Animes don't work at all. No mirrors and if you find one... good luck getting it working. Just today I uninstalled Terrarium TV from my tablet again because the shows I wanted to watch had only broken hosts or so slow hosts that it buffered after every second it played.
So I rather would download stuff that you want to watch and watch it nicely offline without stuttering, buffering and in high quality with advertising or other BS. My two cents after using Terrarium TV for some time on several devices.
~~~ Hey Major!I'm a Maniac and you're no Jesus. Step down! ~~~