Hooboy. I'm not sure where to even start.
The mix of substrata of course contributed to the phosphate level, but it will come down once you add the plants. You really should have added the plants and made some mre water changes before ordering the fish. Anyway, finding a happy medium between what the fish want & what the plants want is going to be tricky; try to stick with plants that like low pH & soft water.
I'm sure that others will pop in soon enough. I have to go, now, but I'll be back.
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