Frankly, I donÃ¢â‚¬â„¢t know anything about Indonesian Tiger Fish, but given the size listed in the profile I found (18 inches?), IÃ¢â‚¬â„¢d be more worried about the Calvus becoming lunch for Datnioid at some point. IÃ¢â‚¬â„¢m guessing size is why people choose to mix them with Fronts?
That said, Calvus arenÃ¢â‚¬â„¢t aggressive towards other species in my experience. TheyÃ¢â‚¬â„¢ll defend a small area while spawning, but they donÃ¢â‚¬â„¢t go out of the way to harass other fish. They much prefer to harass each other. With this in mind, realize that youÃ¢â‚¬â„¢re likely to end up with all but one male Altolamp rejected from the tank no matter how you choose mix them. Multiple males tend not to work out well in the long run.