AI Nero 3 lower cost option, and I'm actually a bigger fan of the AI pumps over the Ecotech. Google Jaebo for lower cost copies that work OK but crap out about the 1 year mark ime. All programable with adjustable min/max flow and ramping up and down. A lesson you'll learn, either the easy way or the hard way, is that you get what you pay for in this hobby and it's worth spending the money up front. Trust someone who's been doing this for 30 years now.