3K and (4) 1" drains may not jive according to this phenominal (one of MFKs best) sticky......
http://www.monsterfishkeepers.com/forums/showthread.php?205645-Pipe-Sizing-Charts-and-Flow-Rates
Could go with one of the full siphon style overflows, or put the tank under the knife and enlarge the holes or seal them and make new...... IF the rays are getting tubbed anyways it might be the perfect time to hack that thing up.
Teeth can easily be replaced with egg great (lol)
I've had to hack up every tank I have set up to allow decent flow rates.... I run Darts on all my tanks, even the ones as small as 150 gallon without throttling anything back. Flow is gooood!!!
Can you tell us more about the tank? Glass or acrylic? Open to the idea of changing where the drains are or rather not?
http://www.monsterfishkeepers.com/forums/showthread.php?205645-Pipe-Sizing-Charts-and-Flow-Rates
Could go with one of the full siphon style overflows, or put the tank under the knife and enlarge the holes or seal them and make new...... IF the rays are getting tubbed anyways it might be the perfect time to hack that thing up.
Teeth can easily be replaced with egg great (lol)
I've had to hack up every tank I have set up to allow decent flow rates.... I run Darts on all my tanks, even the ones as small as 150 gallon without throttling anything back. Flow is gooood!!!
Can you tell us more about the tank? Glass or acrylic? Open to the idea of changing where the drains are or rather not?