Thanks for the advice. No the holes are not drilled yet and I would like two returns on the tank just to improve water movement on the surface to prevent possible dead spots. I like the herbie but how often if ever would the pipes become restricted and or how often does the valve have to be adjusted. From what I've read the bean animal is kind of set it and forget and I don't mind the redundancy for safety that's kinda the way I am overbuild just in case, however I feel like 5 holes in the tank is excessive
5 holes isn't bad, although if they aren't drilled yet, have you thought about a ghost overflow from Synergy Reef?
@mixer911 can probably help here, as his build skills are immaculate. Then you have much more flexibility in your tank. Does the tank have the cover in the corner/middle or where ever, and you are just thinking about drilling in the bottom there? You also don't have to drill the bottom; you can still drill holes in the back wall of the tank. If you have the cover already in place, maybe Rick can help with using a modified ghost overflow where you don't need the front part. If you don't already have the cover with teeth in place, then I would highly recommend drilling two holes in the backwall that come with the ghost template, and two holes at the ends of the back wall for returns. If you don't want the ghost or can't afford it, there are still other ways to drill your tank so you don't have to deal with holes drilled into the bottom. In any case, you definitely don't need to drill 5 holes in the bottom; for the returns, just drill the back wall on the sides for returns and use your choice of eductors, loc-line, etc for return flow. Then you only have 3 holes for the overflow, much more manageable and less intimidating.
The bean animal is just like the herbie in terms of set it and forget it. Since both have a gate valve on the siphon drain, if you keep the return flow back into the tank constant, it will be set and forget. If you change it, for example you have a manifold off the return with reactors connected, and you need to disconnect a reactor, and have to turn off the flow to that reactor, it will add more flow into your tank, which will of necessity cause you to open the gate valve some, and then close it back down when you open your manifold again. It's all a matter of preference and I prefer a bean animal, but there are some great herbie options out there.
Don't worry about 5 holes in the tank, there are tanks with way more than that. As long as you have a professional do it, or make sure the holes are not drilled too close to one another, you'll be fine.
Cheers!
Lloyd