He's about 4 inches in a 120 rite now I have three fluval 406 an a uv light . He's with about 15 tetras I have the temp at 85 an ph at 8. He's been eating algae wafers . I have a resting platform ne'er the surface I read ppl sum times use them think I need it an UVB UVA light are they needed ? Any advice will help thx



