I've got everything going smoothly for half a day now :D
Have you tested it under power failure conditions, especially if you are not around at the time. Can it restart once the power comes back on and what happens if the overflow blocks, if the overflow blocks water will still be pumped back into the tank and will spill over onto the floor.
As Psymon has said having 2 pumps working in tandem is not a good idea at all. Even placing the pump near the surface can lead to major water on floor incidents. If water level drops, as it will do due to evaporation, one or other of the pumps will have to run dry for a period of time unless you fit an auto top up system. Again as Psymon mentioned calibrating the 2 pumps will be a nightmare and not something I would like to attempt. Your best option in my opinion is the overflow system, cost more now, but in the long run it will be cheaper compared to equipment damage and clean up costs etc. I wouldn't attempt drilling either unless you have experience drilling glass as the glass can crack quite easily and the drilling can alter stresses within the glass causing it to fail later on.
I am using TMC Tile and Strip LEDS and they are also encased in plastic housings, but the manufacturer still recommends not putting them in hoods and to keep air circulation as optimum as possible. The factor with these lights is also one of heat and they require good venting.
Suey you should know my humour by now. Yes I was joking about the blue ringed and the jelly fish although I have seen them for sale once or twice on my travels around the shops of Britain.
I have seen 2 Hydrocynus goliath for sale recently along with the usual catfish & Snakeheads suspects.
Still deciding what to put in the second tank although it will be a venomous/Stingy variety of fish, smaller Lions Scorpions, Rhinopias Scorpions, Leaf fish, Wasp Fish Coral reef, that kind of thing, Still researching coral safe species at the moment.
I agree with Finnipper, there are some strange additions and omissions from the lists. No real thought gone into the selections.
I am still working on that whilst my tank matures ready. I am toying with a Blue-ringed octopus, nice and deadly but also hard to get off. I have even had the thought of a box jellyfish or man of war, but again not the easiest of things to find on the market. Failing that various species of Scorpionfish, Lionfish, Stonefish, Leaf fish and Wasp fish.
I have done peaceful and harmless with the occasional "watch out or I will bite you" types, so now it is time for a little more interest and danger.