As far as the plants it can be troubleshot if you want to take the time I could help you fix it. I have a high-light CO2 system, and a low light non-CO2 system, I have been through bad troubles with both of them and now they are both running great. IMO you need a multifactorial approach to deal with it including substrate, macro and micro ferts, lighting balanced to CO2, and an algae-eating crew to include shrimp otos and snails. But if you want to keep clown loaches IMO they are not well compatible with a planted tank because they will eat snails and probably shrimp too.
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