Welcome Andy!
Your plants look great and I'm not sure you need a heat lamp, the temperature of 68ยบ should be fine. The lights should be fine too but I agree with Ken that you don't want the plants to be too close to the lights or you will end up with leaf burn. I grow
Blushing Philodendron (Philodendron erubescens 'Pink Princess') and mine stays on a screened porch (eastern location) where they get bright light but no direct sun. I did grow it indoors for a couple of years in fairly low light and it did great in the lower light situation too. I think the unknown plant is a Bromeliad also, possibly a Neoregelia.
The flies you are seeing could possibly be fungus gnats:
http://en.wikipedia.org/wiki/F...
which sometimes occur when the soil is too moist. You can read a couple of articles here that our members have posted about controlling fungus gnats:
http://garden.org/search/index... I use insecticidal soap (which works for a few different plant pests) that I purchase at Home Depot.
