Sounds good to me, fans and shade would help, I fyou have your tanks on tile or linoleum you can also drop the air temp around them with evaporation cooler made by placing a bucket of water above the tank and inserting one corner of a sheet into it with the rest of the sheet spread down and over the tank, water will wick down the sheet and evaporate providing some cooling, only a few degrees though. I would be careful that your ice buckets are very clean and don,t have any soap or solvent residue in or on them. You would hate to kill fish while trying to keep them cool.