The lighting is just a flourescent lighting
Would be fine for a FOWLR
tank. No upgrades needed unless you went reef.
substrate- I have Eco Complete, colored gravel and natural gravel (not all together)
Need to change that to marine sand IMO
. The LR
you get will seed it with life.
Filtration- I think its a HOB whisper
Would be OK with the addition of LR
, a protein skimmer and good water movement. For SW
you target 10 times the water volume of the system per hour. A powerhead would most likely be needed.
The other stuff like a heater and thermometer you already have and could convert.
Also salt mix, water test kits would be needed.
Wouldn't be to bad as far as costs and you could get the LR
a little at a time.
Hard to put a price tag on it. I would research the net and you LFS