i need some help settling a debate with the guys at work. i set up a 280g about 2 weeks ago. its running 20g in the sump(300g) total. i also put a 315gph canister filter with about 1gal of mature biomedia in it, there is a brand new marineland commercial biowheel with im guessing 1/3 cubic feet of bio media. all running at 1500gph. ive had a 16" niger cat, a 6" irwini cat, a 10" fire eel, 6" african leaf for about 12 days and just threw a 8" frontosa in there this morning. ammonia, nitrite and nitrate all undetectible. im replacing the biowheel with 2.25 cubic feet of scrubbies monday or tuesday. now, my big question is, should i add two 12" rays to this next friday. i want to hold off for my tax return (2-3 weeks) but my buddies are saying i should bring them in friday for a party im having saturday. im thinking ammonia spikes.