I just ordered a silver arowana at like 6in, he'll be put in a 75 gallon with my 6in shovelnose and 6in albino knife fish, the tank has a tiny gravel bottom and live plants and a log. I use that easybalance stuff from tetra, weekly water changes, and keep a flourescent light on for as long as its bright out and turn it off while its dark. Will that be ok for him or should i do anything else or will that easybalance fix the hardness and ph? And will these fish be ok together? Please help me!!