Model Suggested Minimum GPH Optimal Recommended GPH Single 3/4in RFG (RFG075) 180-200 420-500 Two 3/4in RFGs (RFG075) 400-500 700-800 Single 1/2in RFG (RFG050 ) 120-150 300-450 Two 1/2in RFGs (RFG050) 250-400 640-670 Single 1in RFG (RFG100) 320-400 720-1000 How do you install the RFG Nozzle?Easy – the 1/2in and 3/4in RFG Nozzles sizes simply snap to the end of genuine Loc-Line branded modular hose. The RFG was specifically designed to easily attach while still maintaining a secure fit. How should the RFG Nozzle be positioned for the best resutls?The Random flow Generator Nozzle is more than just a nozzle. As such, there are some tips and trick that can help you get he best randomized flow. How do you use the RFG?The RFG Nozzle is designed to produce a more random flow pattern than standard loc-line nozzles. This can be very beneficial to your reef aquarium. Corals tend to grow in more natural patterns when the flow passing over their branches is not laminar in nature. Use the RFG Nozzles on your main return lines or in a closed loop system. When supplied with at least 290 GHP, the nozzle begins to produce a randomly oscillating flow pattern. Use more than one RFG in your aquarium for even greater effect. I have an All-in-One Aquarium, will it fit?If your aquarium has a 1/2” or 3/4” Loc-Line® fitting on the return line then yes, the RFG will fit your aquarium.We also have a number of fittings and adapters designed specifically for many of the most popular aquariums, such as Red Sea MAX™ and Reefers® system, BioCubes and All-In-Ones such as Innovative Marine. Is the RFG Nozzle like the other accelerator or vortex nozzles I’ve seen? The RFG Nozzle’s represents a twist on an old idea with completely new results.The primary focus of the RFG is creating a random flow pattern, as opposed to accelerating the flow. This means you can crank up the flow on your return pump without blasting your coral or aquascape.The internal shape is very different from the standard accelerator nozzle that we all know. Instead, the RFG contains 5-vane internal helix that runs nearly the entire length of the nozzle and form a set of internal channels. Each channel is connected to an eductor at the base of the nozzle.This internal spiral, together with the eductors, contributes to the distinctive water moving properties of the RFG Nozzle. The old school accelerator and vortex nozzles simply can’t create the type of water movement the RFG is capable of.