I have my catts in the same medium and situation, really.
Aparently, they like wind and enough sun to put a bit of red on them especially if they have lailia in their genetics.
That extra sunlight will get you blooms. They will grow in a dimmer light, but not bloom. Look for a light situation that gets you light green leaves with a slight amount of red on the leaves. Some are happy with more red. Yellow means too much sun.
Lava is good but if the are outside you may end up watering every day. I am in New Mexico and I leave them outside all day (in January) and bring them in at night unless the temp forbids it. It is already warm enough here for Catts outside.
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