Advertisement So it's been nearly two years and my Lava Rock Grotto terrarium has started growing on me. It houses a group of Phyrnus marginemaculatus. For lighting I use a 13 W 6500K Philips brand CFL. As for plants I use Anubias nana 'petite', Davallia repens, Davallia parvula, Vriesea racinae, Crepidomanes minutum, Begonia pteridiformis 'red form', Corybas pictus, various Ricardia and Ricca, Bulbophyllum alagense "small form", a Trichomanes sp., and a bunch of different filmy ferns I forgot to keep track of. Also have a mini Bucephalandra in the water feature.