Hey sorry for the late response. I dose EI for a simpler routine and so I do have ferts in excess. Everything's all nominal now, but my biggest guess would be with excess traces. Prior to the massive growth spurt, my AR was crumpling up which (per 2hraquarist's post) meant trace toxicity. All my plants were struggling. They began to really take off after a water change and no trace dosing (aside from DTPA 10% Fe) and I was running lights so high they were growing faster than I could maintain. I assume the massive plant growth created for a low CO2 environment provided I didn't adjust it, which (paired with high lights) created a suitable environment for all types of algae. I've since lowered the lights and everything is growing great at a more manageable pace, no massive algae growth as well.Did you recently plant or do a major trim and replant? Your statement that the plants have really taken off over the past "few days" makes me think that perhaps this is the case and they've finally established well enough to start growing well. Am I in the ballpark?
Something else you could be seeing, especially in regards to the GDA, is the explosion in growth causing heavy uptake of one nutrient over another, causing an imbalance.
Do you test for N and P?
What's your normal dosing regimen; concentration (mg/L or ppm) per frequency? For example, 10 mg/L NO3 3x/week