Hi bro, save your corals first.
I had this problem when I first started, you can try what I did.
Buy a plastic tub, link it to your sump and grow algae in it. Slowly the algae in the main tank should die off.
You should try bio pellets too!
What's your tank thickness? Looks thin to me. Better change tank and stand, no point stocking up and few weeks or mth later tank give way. Touch wood. Then you will end up spending more mOney.