You would need more light. If you are using both lights on the 29 gallon, that makes just over 1 watt per gallon which is very low light That very well indeed might be part of the problem.
I can't tell you about lemon juice as I never used it in my tanks. I have my peppermint shrimp.
About that mystry critter you have. Do you hear a clicking? Does it have a bunch of legs? If it came in on your rock it may very well be a mantis shrimp. They can become very long. If it is one don't grab it. They can give a very nasty sting. Get a flashlight with blue or red lense to look in the tank at night. You won't startle everything that way. I got moon lights for night time.
A refugium is a place for you pods and micro algae to grow. Some people, like me, have their refugium in their sump. A sump is where you can hide you protein skimmer and other equipment so that it is not on your tank. A protein skimmer helps to take the waste out of your water. Micro algae helps to lower your nitrates.
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AGA 120 Megaflow, 2x 250w HQI MH and 2x 54w T5 Actinics, Euro Reef CS135, Sump, Pacific Coast 1/10 HP Inline Chiller, PanWorld External Water Pump, Red Sea Wavemaster Pro, 4 power heads
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