i just inherited a 150 gallon aquarium from some relatives. they have kinda neglected it for the last year or so. they emptied it out and now i have this dirty thing! so the first thing i do is get some cleaner and scrub like no tomorrow. well people are telling me i ruined it - and now by getting on-line for advice - i see i looked a bit too late! what can i do to fix what i have done? thanks