Hello. I purchased an Electric Blue Jack Dempsey last week. It's about 1 1/2". I also bought at same time more Cardinal Tetras to add to current school in my 55 gal. I asked lfs if this was ok to mix, along with my very large 2 Angels, a yr. old.. & I was told yes. Further research indicates absolute no. Tetras will disappear. So I set up my 29 gal. for the Electric blue jack dempsey but now read too small of a tank? Oi. So then I thought well I can put the Tetras & mollies in 29 gal & leave jack to grow up live with my Angels. Would that be safe? I'm just at a loss of best direction here. Getting another large tank is not an option unfortunately. TIA.