My grandma was an orchid grower, but I don't think she was using a lot of different fertilizer, just regular macro and micro dry ferts. I guess I understand the view about just get them all, even in only 1.5 months I'm doing that with the feed. Started with a cheap pellets for my fishes, then I got flakes because I got the wrong type of pellets. Then because of shrimps, I got several kind of feed to rotate. Because of chili rasbora having trouble eating, I got micro pellets. Since I have all those, I just rotate them when feeding my shrimps and fishes.
DIY dry fert is not that hard to figure out but I just don't think they're practical for me since I only have a small tank and there is no plan in the future (at least in 1 year time) to add more tanks. So if I buy dry fert like KNO3 or KH2PO4, they come in 1 kg package.
To dose according to Tom Barr's non co2 suggestion which is a scaled down EI dosage, I need to dose 1/32 teaspoon of KNO3 and 1/128 teaspoon of KH2PO4 plus 1/16 teaspoon of seachem equilibrium to a 5 gallons tank (mine is actually 4.5 gallons) weekly or every two weeks. So have to dilute them with water to make it easier to measure the dosage. The KNO3 and KH2PO4 will probably outlast the tank since I only need a small amount weekly.
Alternative to that, I can get maybe 3 types of ADA liquid fertilizer and just do 1 pump each daily which is much easier.
It'll be a lot more expensive using ADA but for a single 4.5 gallons tank, it is not a big deal.
Not sure if this is correct or not and if I understand it correctly.
I got this info from older thread:
Looking at that I use the EI daily as guideline, I want to dose about 10% of the EI daily since I have non co2 low light tank:
If I does Green Brighty Step 3 + Green Brighty Special Shades, I got the following:
Since ADA's pump dosage is based on 20 L and mine is 17 L (actual water is less than that), the actual dosage is around:
Close enough to 10% of EI daily?