Excel is not needed for plants if you are injecting CO2 at sufficient rates. If you are using Excel as an algaecide for red algae (BBA and other hair-type algae), you will need to dose it at the recommended dosing, at a minimum. However, there are better ways to control algae, unless you have a problem outbreak. It is not effective against GWA, GSA and GDA.
When Excel is dosed daily, as per instructions, it may melt Anacharis (Egeria/Elodia), Vals, Duckweed and Marimo moss balls (which are a form of algae). These plants can be trained to use it if adapted slowly by not doing the recommended “initial” weekly dose and then just half-dosing every other day, gradually building up to recommended levels. Vals, for example, will initially melt and then re-grow fully acclimated to it.
Adding Equilibrium will not be a problem, if not overdosed. Your GH reading of 4 dGH indicates that you are far from overdosing. If you think there is a problem with the API test kit, first check the expiration date on the API kit. If it is good, you can do a rough calibration to check that it is working by adding 890mg (approx. 1/8 teaspoon) of Equilibrium to 1 gallon of distilled water. The API test result should then be in the 4 dGH area.
Since im facing some BBA and Staghorn, im planning to so spot treatment only a day before WC.
My co2 is now at approx 3.3bps
Po4 was 0, added today as per EI-daily, double the dose, as tomorrow is WC day.
Added a tiny 12v pump for a dead area.
API expiry is 2022. Initially i never added any equilibrium, there was no melting at all. Added as my gh was only 3. However i have see alot of salt creep in my other FW tanks, so im guessing i have good amt of calcium. As for mag, teopica has mag, also planning on buying a good mag testkit, but in my country, only saltwater mag testkits are available.
I checked tropica premium for EI daily, it shows 15ml, thats kinda shocking for 105ℓ, its 7+ times of the recomended dose. I tried calculating, but w/w% to ppm conversion is too confusing. So im deciding to continue with 4ml daily, which is already double the dose.
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