Another benefit to Eco Complete is that it tends to hold the roots better than Laterite. That being said I have also had good success using crushed granite (chicken grit) at $8 / 50lb. bag at Buckerfields
Tony, are you planning other plants than Anubias and java ferns? Both of those do better unplanted (grown over driftwood or rocks) as their roots tend to rot otherwise.
Both are lower light plants though and easy to grow. I've even grown them under normal fluorescents. Some other good low light plants are Tape grass (
Valisneria spiralis) Contorted Tapegrass (
Valisneria spiralis 'tortissima') Elodia (
Egeria densa) Pearlgrass (
Hemianthus micranthemoides) and Windelov fern (
Microsorum pteropus 'windelov')
Here's my old 33G. with normal fluorescents and chicken grit:
