Anglers: fish walks in saltwater tanks

When I first saw the Angler fish, I am amazed by both their beauty and behaviors. Their color will change according to the environment, more interestingly They walks and fishing. In the photo below, you can see their fins have adapted for the walk, Stronger than other fishes.

Angler fish walks in saltwater tanks
Angler fish walks in saltwater tanks

They also fishing. They have an illicium grow on their head, it looks like a worm. The illicium will wiggle and lure other fishes close the Angler. That’s their fishing technique.

Angler fish does not need a large tank to keep, Since they are small in size and not a good swimmer. Most angler sold in local fish store will grow to 6-8 inches, so a tank of 20-30 is ok for them. But wait, don’t buy a angler yet. They are predator, will eat your fish and shrimps twice their size. On the other side, aggressive fish, such as puffers, will prey on Angler. So it is best to keep angler alone in the tank.


If the angler does not eat after you put it in your tank. Go to petsmart or other pet stores to get some live glass shrimp. Next, you can train the angler to eat frozen food.

Anglers: fish walks in saltwater tanks
Anglers: fish walks in saltwater tanks

Raspberry Pi drop WiFi connection

I built a reef controller with Raspberry Pi. Basically it is just a replay controller, It controls when which replay should be turned on. But there is a problem. it will drop the Wifi connection every few days. This is really annoying since I need to monitor the equipment remotely using internet.

The solution: writing a script to detect the lost a Wifi connection, it the connection lost, then reboot the raspberry pi, or just to reset the wifi connection. But the best way is to find the underline cause. This is caused by the power saving mode of raspberry Pi. The pi turned the wifi off to saving power. We need to make the following change to disable the power saving mode.

1. Create a new file in /etc/modprobe.d/8192cu.conf

sudo nano /etc/modprobe.d/8192cu.conf

2. paste the following in

# Disable power saving
options 8192cu rtw_power_mgnt=0 rtw_enusbss=1 rtw_ips_mode=1

3. reboot with sudo reboot