Internal reflectors are reflectors built inside the bulbs....not all bulbs have them.....I have never used T-8 connectors myself, but I would almost assume they are different due to pin size of the bulbs.....Personally I would never use those endcaps/connectors you posted over a tank, especially a saltwater tank. To many chances of corrosion to occur and a good place for current to leak or short, and give you a good zap.