I just got a shipment of plants (water sprite, amazon sword, anacharis, anubias, water lettuce, hornwort and cabomba green). I had an anubias before but it died a few days after I had it, I think because I planted it in sand. I still have 2 Java Ferns that are doing great. Whats the best way to keep these plants alive and healthy? I bought seachem Flourish and some root tabs. Anything else I should do?