I wouldn't do the brick chips myself, they are in to large chunks and they are pretty rough stuff. The probably arn't poisionous though. I would go the catlitter or flourite route, construction sand mixed with flourite or laterite is oK. I use construction sand with my RTC and some of the oscars. For a great and cheap alternitive you can get shop lites and build them into a hood. You can get more lighting and grow just about any plant you like 3watt per G should grow just about anything out there.