Buffer tank outlet

Got a used tank with a 90 tube pointing downwards inside the tank. Which should pull water below the bulkhead.

I started unscrewing it as I feel it causes restriction. but was wondering if this Should be left alone???

Complete matter of preference. That little elbow won’t cause any noticeable restriction. Some people don’t like to draw right from the bottom of the tank, since they think it causes more sediment to get sucked up.

I have elbows and 8” downtubes on the backside of my bulkheads (tanks are recessed into a hole in the bed), and it draws just fine.

Leave it.

it’ll help when the water gets low to keep a vortex from happening and start sucking air. Leave it.