Updated 8/4/15, 11/26/15, 12/27/15
After moving the original 2.5-gallon tank colony into the 18-gallon, I decided to experiment with the 2.5. Based on accounts by Dennis Nakashima, I decided to see if opae’ula could thrive in a mix of ocean water and bottled water. I decided to go with a 1-to-1 ratio of salt to fresh. I got the ocean water from Ala Moana Beach and used bottled water instead of the tap water used by Nakashima. I stocked the tank with 10 shrimp bought at a pet shop in Honolulu. For the UGF, I used the remaining half of a 10-gallon set. (I used the first half in the 5-gallon Fluval Chi.) Since it didn’t fit in its stock size, I used a hacksaw to trim off a side to make a tight fit. I chose a test subject from the bag of shrimp and placed it in the tank. It seemed active and healthy. I waited a few more hours to see if it would suffer any ill effects. It was fine, so I added the remainder to the tank. Thus far, after three days, the small colony seems fine. The tank is very close to the west-facing windows so it’ll receive a lot of sun during the day and a huge amount in the late afternoon. Update 11/26/15: I noticed a slow leak in this tank about a month ago and moved the colony into another tank. I won’t be using this again.