When choosing a mixed fish species, you can consider the following points:
First of all, there must not be a large gap in the body size of fish that co-exist in a single tank. Large fish often tend to bully small fish. Second, to grasp the feeding habits of mixed fish, a mixed pool of fish of different dietary habits will lead to the phenomenon of neglecting each other. Third, we must consider the adaptation of water quality and water temperature. For example, African cichlids like the water with higher PH value. Colorful angels, blood parrots and other fish prefer water quality with lower PH value. Many tropical fish are not liked very much. In high water temperatures, some fish such as koi and goldfish do not need to be warmed in the winter; fourth, fish that are more aggressive should not be polycultured with fish whose habits are more moderate, on the contrary, fish that are aggressive are mixed together. On the contrary, it is possible to reduce the attacks between each other; the last thing to emphasize is that the polyculture fish should strive for uniformity in the distribution of space, and some fish are very strong in the field, and to avoid competition due to the density is too large to compete for the site.
When installing security Outdoor Camera, you should first choose the monitoring host. Do you want to add a monitoring card to your computer, or do you want to use an embedded hard disk recorder as your monitoring host. The computer monitoring card is more suitable for places that are familiar with computer installation, have professional personnel on duty, and have more functional requirements. Its overall investment is relatively low. Since the monitoring card is installed in the computer, the computer needs to be started 24 hours a day; As for the latter, it does not require professional knowledge, nor does it need to be on duty, and it is relatively simple to operate.
To install security monitoring equipment, it is necessary to determine how many cameras are installed, and the quality and monitoring range of the cameras are affected. It is preferred to determine how many cameras are used for monitoring, and then determine the camera lens monitoring range according to how many cameras are available. Therefore, the distance from the camera to the monitoring point and the monitoring area must be clear. The infrared supply network recommends using the camera of 480 TV line, because it is more in line with that definition.
When installing security monitoring equipment, the third consideration is whether the camera has night vision function. If the monitoring is installed in a dark place, it is necessary to consider using a camera with infrared night vision function.
The security monitoring equipment can be installed via wired or wireless transmission. Although the cost of wireless network is relatively high, it can save a lot of installation trouble and make the monitoring site more beautiful. However, the installation of wireless network monitoring equipment should take into account the environmental problems of security sites. Cement building materials will shorten the wireless transmission distance, and metal building materials may complete the shielding of wireless signals. The infrared transmitter and infrared receiver should be far away from other appliances to avoid interference. Because the price of wireless network is almost twice that of wired transmission monitoring equipment, I suggest using wired transmission installation.
On site monitoring and network monitoring When determining the installation of the monitoring system, you should consider whether you need network functions. That is, if you need to monitor and control the monitoring site on the Internet at any time, you need to select a monitoring host with network functions. Avoid no network transmission function after installation.
A complete security monitoring equipment should at least have three parts: surveillance camera, PTZ and decoder. The following are their installation methods:
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