Help with Fertilization in 75g
In my 75 gallon I've recently run into some problems with algae growing on the glass as well as some bba. I'm running 2 T5HO's over it sitting 19 inches over the substrate.
I used to dose flourish comp bi weekly and excel 3x a week and all of a sudden I'm getting a ton of bba. I've recently run out of excel just last week. To my understanding algae is caused by an imbalance of light/co2/nutrients. My lighting to my knowledge is at the high end of medium light, I think?
I've heard of the low tech EI method but I cannot do more than 20% water changes a week. Generally each week I do a 5 gallon water change. Where I live our well water is rather limited. Our house was built on a particularly low level of groundwater. Apparently when they build your house you aren't guarantied water. It refills very slowly and we have two 150 gallon totes of water as safety if we ever run out. Large water changes are out of the question. Probably not the best hobby to have in my situation.
Liquid ferts are getting way to expensive, so I'll have to order dry ferts sometime soon. But, first I'd like to have a plan on how to dose the tank.
What can I do with small water changes and getting my plants healthy?