I tried a picotope, i think the same one as you, 3.5 gallons, and it came with a little mini light...if it's the same one, i'd replace the light, it didn't seem to do much, and all i had was some gsp, some frogspawn and some zoanthids. i replaced the light with one i rigged from a bjb all in one (the small 12 gallon i think)....anyhow, hope it goes well!! good luck!