DOYING, you will be fine w/ what you have, :joy: as for NO LIGHTS, NOT a good thing to do, ALL thing need light, of some kind. don't know of anyone who has a DEEP WATER TANK! lights will effect all the growth in your tank an keep your TANK ALIVE an WELL an KEEP the INTERNAL BODY CLOCK for your ( fish or shark) in check.
GOOD LUCK GOOD REEFIN :joy: