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Mark. How much flow do you have in the tank. Or is this a dead spot where flow is to low?

Of course. If it ain't broke, don't fix it.

I've been in the hobby since 1972. I've seen or heard of more check valves causing problems with tanks then just having a siphon break.

Between these siphon breaks and keeping your suction line about the level in this pic, you will have little to no water flowing back to your sump. The less mechanical parts in a salt water tank, the less problems down the road. If a snail or something makes a check valve fail (at the worst time...

Like Edwin said. Your return line should (1) either be just below the water level in your tank or (2) drill a pinhole in the return line@ the water level but slightly pointing into the water.. The whole idea is to create a siphon break which will stop the water from draining back into the sump.

I use these valves. If you ever have to work on the pump, just turn off the valve and unscrew the fitting. I don't trust anything else with moving parts. They always go bad at some point. Cepex Ball Valve

Calcium is 305. I don't have a paper for Salifert Alk, but if you can post the paper, we can show you what your reading is.

Your Mag is about 1130

I hope this is a typo

Give them a number of an NJRC member in your area to call if something looks different from the day before.

That lasted about a year. ^

Schools didn't work out. We setup or donated stuff to a Newark school. The teacher had to take care of the tank herself. Schools don't allow outsiders inside. The teacher had to setup and break down the tank a few times a year on holidays and summer-spring break.

We also did a coral and frag tank at John and Phyls house for a long time. They had no complaints but, It was very costly with lights, pumps,water changes, water testing......

We also set one up in Camden before that that never panned out.

I have a generator you can borrow. In Port Monmouth NJ

Yes. If you look at them, the fins are pointed in different directions. Switch them around.

You seen it. The one that my seal broke on.