DIY Breeding/Isolation Net/ Box - YouTube

Use a net to separate your fish with aggressive breeding or social behavior! Measure your fish tank and weave a rope through a net in a square or rectangle to match your tank’s dimensions. Cut the net around the outside of the rope to reveal the square net, hang a suction cup hook on each corner of the net and install the divider in your aquarium for as long as needed. Consider making additional net dividers to separate your tank into several sections.

A little green fishing net as tool for fish tank. Image isolated on white studio background.

I just got started this past month and have taken my time and I believe gotten things right. I started with a 10 gallon tank and now that I have chosen what types of fish to stock... the smaller varieties, I was needing to know at what point does one stop adding new fish? What's optimum for not overcrowding. I poked around the net and haven't found any real answer. Is there a gallon to small fish ratio or something I can use as a guideline?

Mosquito net over tank against fish jumping out? - The Reef Tank

Pink White Handle Landing Net for Fishermen Aquarium Fish Tank 18.7in 24.8in 20.5in 17.1in 15.6in 22.2in Unique Bargains 15.6in Ny The Penn-Plax Quick Net Fish Tank Aquarium Catch Net is an extremely strong net that’s made for safely retrieving fish. It features a long handle covered in three-ply vinyl for a secure grip, even when it’s wet. The Penn Plax Quick-Net contains a soft nylon "Quick Mesh" for fast, safe catching. A good aquarium net is imperative for any aquarist. This sturdy, long-lasting net helps secure your fish gently and quickly.

I want to cover the tank so fish cant jump out

The Quick Net Aquarium Net is a great tool for catching your fish when routine tank maintenance is necessary
Measures 3.375″ D x .250″ W x 12.250″ H
Features a vinyl covered handle for added strength and length

You think white mosquito net would be ok

Later that same evening, I was relaxing while watching TV and checking out the fish tank. Scott and his wife had gone off to the kitchen to get more drinks and snacks. While they were gone, the lights on the display began turning off, which caught my attention. I looked up and noticed that while most of the fish had gone into hiding, that lone troublesome clownfish was front and center. You see, the rest of the room's lights were on, leaving the living room fairly bright. This fish was orienting itself to the room lights. Being a long time fish geek and student of fish behavior, I quickly realized that this was a golden opportunity to catch this fish. Based upon this short observation and my experience, I was fairly confident that this fish would stay along the front glass, keeping toward the light, and this would make for an easy removal. I called to Scott in the kitchen and asked him where his fish net was. He seemed a bit reluctant to get it for me, but also seemed to want to humor me. We opened up the top canopy, and I made my attempt at removing the fish. Although somewhat disappointed in myself, it took me two swoops with the net and almost 30 seconds to catch and remove that fish. I must be getting a little old and rusty! Back when I was catching fish day in and day out at the local fish store, that little clownfish never would have escaped my first swoop. But, out he went nonetheless, leaving Scott both a bit baffled and amazed at the same time.Probably the most important thing to remember when you are usingthe fish net is to try to move the net slowly. Slow movement of thenet will be less startling to the fish and will increase your chancesof the fish staying near the net, while moving the net around the tankquickly startles the fish and encourages them all to hide. Also, whenthe net is moving quickly through the water, it does form a "bow wake"or "bow wave" which can actually push the fish away from the openingof the net.