Opae’ula Zoeae – Another Batch 3 Feb 2018

Last updated 2/19/18

Update 2/19/18: Correction: The zoeae are probably from the same batch reported on Jan. 29.

Posted in Uncategorized | Leave a comment

A Dozen Opae’ula Zoeae in 10-Gallon (West)

Last updated 2/19/18

A dozen opae’ula zoeae in 10-gallon west-facing tank. A few berried females, too.

Posted in Uncategorized | 3 Comments

Opae’ula Noon

This is the 18-gallon filled to the 10-gallon level. Reversion to UGF with air filters (turned on intermittently) and switch to tap water (left standing overnight to disperse chlorine gas) has had very positive results. The tank is thriving with active breeding. It’s close to the south-facing windows where it gets a lot of sun throughout most of the day. Decided to switch the 10-gallon that gets late afternoon sun from the west-facing window back to UGF and air filters.

Posted in Uncategorized | Leave a comment

Breeding in One-Gallon Tank

One-gallon tank. I haven’t done any water changes. I don’t feed them. The only maintenance is a topping off with tap water when needed. The Aqualifter system seems to be working for this setup. I’ve never had to clean the tubes. I just leave it running 24/7.

See the berried female?


Difference between normal and berried opae.

A closer zoom-in.

Posted in Uncategorized | Leave a comment

Opaeula in 18-gallon Tank: 27 Dec. 2017

Posted in Uncategorized | 5 Comments

Breeding Opae’ula in a One-Gallon Tank

Posted in Uncategorized | 5 Comments

Experimenting with Tap Water for Opae’ula Tanks

Buying cases of bottled water for the brackish water mix in my small tanks has been such a hassle that I’m taking a serious look at tap water. Dennis Nakashima uses tap water, apparently without any problems.

My nephew, a hydraulic engineer with a private firm, has worked with the Honolulu Board of Water Supply on a number of occasions and is familiar with our water quality. He says that the BWS does add chlorine to our tap water in Honolulu to control bacteria — but not chloramine. This is good news because chlorine gas can be removed easily but chloramine is a different story.

Other parts of Oahu and Neighbor Islands may rely on different chemicals, so it’s best to check. My nephew provided further information:

Click on the link below to get the water quality report for you property:


Once you get to the website click on:

Search for and download the 2016 Water Quality Report for your address

Type in your street address (no need to include “Street”).

I’ve read that leaving water out in an open container overnight will remove chlorine gas. There are other natural methods, including leaving the open container in direct sunlight, swishing the water around with your hand, pouring from a higher distance. I could boil the water, but that seems inefficient. I could purchase a water filtering system, but that seems expensive when maintenance is factored in. Mechanically, I could run an airline from a pump into the water to speed up the dechlorination. I could also add chemicals, including vitamin-C, but I don’t want to take the risks involved.

Leaving the water out overnight in a 3-to-4 gallon open tub seemed to be the easiest, most natural, and least risky method. I then poured the water into empty plastic water bottles for storage.

In this process, it’s important to remember to be very careful when using buckets, bottles, funnels, etc. that have been washed with soap. Be sure to rinse thoroughly to completely remove all residue.

The Water Cycle,” Board of Water Supply.

I also realize that tap water could contain other natural chemicals that might impact water quality. However, Honolulu’s water supply seems to be very clean:

Most of Honolulu’s consumers get their fresh water from the island’s extensive aquifer systems…. Aquifers are permeable rock formations from which fresh water can be drawn. In some cases … some of the wells are artesian which means … this water … has taken hundreds or millions of years to filter down to the aquifer rock.1

Thus, I’m hoping that our island’s natural filtering system has removed most if not all the potentially harmful chemicals.

The Water Cycle,” Board of Water Supply.

There’s also the possibility that the plastic containers that I’m using might somehow add chemicals to the water. I need more info about this.

This morning, I topped off the 18- and 1-gallon tanks with the dechlorinated tap water. I’ll continue using bottled water for the 10- and 1.5-gallon tanks. If this experiment proves successful, I’ll switch completely to cleaned tap water.

1 Larry Kobayashi, “What Is the Current State of Fresh Water Supplies in Honolulu and Oahu: Will We Have Enough Water for the Future?” Hawaii First Water, LLC, 12 Sep. 2014.

Posted in Uncategorized | 13 Comments