Some friends will appear soon after the opening of the tank aquatic weeds yellowing, brown, the edges of the leaves begin to blacken, spots, holes or become transparent on the leaves, excluding the influence of algae, you may be going through a process, that is, dissolving leaves. Please do not worry, first analyze why this happens, in fact, there are many kinds of situations in which leaf dissolution occurs, mainly due to changes in water temperature, lack of trace elements, excessive nitrate content in water, phH is too high, drug damage, aquatic grass to water and other reasons.
1. Water temperature control
First of all, you need to have a thermometer that can be measured correctly, don't be greedy and cheap to buy inaccurately. Most aquatic plants can grow healthily in water temperatures between 25-28. In the case of rising water temperature, the demand for CO2 by aquatic grass increases, but the high water temperature will reduce the solubility of CO2, so it cannot be photosynthesis normally, and the grass will naturally become yellow and "thin" when the body does not grow. The solution is to maintain normal water temperature, reduce fluctuations in water temperature, and increase CO2 emissions.
2. Nutritional control
Nutritionally unbalanced aquatic grass grows too thick, the upper leaves receive light normally, the old leaves below can not receive light nutrients can not be fully supplemented to begin to dissolve the leaves, if even the stems begin to gradually transparent and dissolve, then it must be potassium fertilizer is missing. The solution is to remove the old leaves that have been melted, strengthen the light in an appropriate amount, and add the trace element fertilizer that the aquatic plants lack in an appropriate amount. (What fertilizer to add according to the condition of the leaves will be discussed later)
3. Water quality control
Raise grass first raise water, stable water quality plays a very important role in the growth of aquatic weeds, frequent and violent changes in water quality usually lead to discomfort in aquatic weeds, usually to develop the habit of detecting water quality, in addition, the choice of landscape stone will also have a certain impact on water quality (green dragon stone generally makes water harden), the general aquatic grass (not all aquatic weeds) suitable for PH (pH) in 6-7, GH (hardness) in 5-12, TDS (dissolved total solids: can be simply understood as impurities) below 500ppm. The solution is to change the water, once a week to change the amount in 1/3 to 1/4 is better, pay attention to the water source to be consistent, do not tap water today tomorrow pure water, change the water and the water temperature difference in the tank is not greater than 3 degrees. (Don't expect to add cool water to call the heating rod to raise the water temperature again)
4. Effects of the drug
Some friends encounter the problem of algae when raising aquatic weeds, often think of drug removal, in fact, some algae in the early stage of discovery can be completely removed by physical and biological methods, do not blindly think of "medicine to disease removal", coupled with the improper use of drugs, a large number of residues in the tank, will also make the aquatic grass produce leaf dissolving phenomenon, "is the drug three points of poison" This must be kept in mind, some aquatic weeds are indeed not very resistant. The solution is to prevent the occurrence of algae, even if the drug is best before changing the water, so as not to leave a large amount of the drug on the aquatic grass and cause unnecessary harm to it.
5. Water grass to water
When the water leaves are put underwater, it is an adaptation process, so this process is called turning water. The general aquatic weed merchants will use away water or semi-water cultivation in order to produce, and then turn water to sell, so you may not have completely turned water when you buy aquatic weeds, and the dissolved leaves are very normal. Some friends will say that I got it from a friend's tank, and the water weeds that change the place will also produce a situation of "water and soil dissatisfaction", as long as the breeding method is similar to the original, and then the new leaves will be restored. The solution is to see if the rhizome is rotten, trim the root and trim the stem, clean the water grass, some water grass as long as the rhizome is okay, plus reasonable light and nutrients, and so the old leaves melt away, grow new leaves will be OK.
The above 5 situations are the reasons why the dissolution of leaves causes water weeds to turn yellow and black, and I hope it will help you.
(The above views only represent my personal, if there is any disagreement, please point it out, thank you)