I have a ropefish and two albino bichirs and also two violet dragon gobys.. i intend to do a brackish tank for the gobys eventually ..when they are large enough to go with catfish..in their brackish tank.. i have the two gobys by themself in a 75gal tank..would it be okay to add the bichirs and ropefish to that tank while the gobys grow out more..thanks for your advice in advance..